Standard Ignition KS116 Ignition Knock (Detonation) Sensor

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Standard IgnitionPart #: KS116

Standard Ignition KS116 Ignition Knock (Detonation) Sensor

Name: Standard Ignition KS116 Ignition Knock (Detonation) Sensor
Brand: Standard Ignition
SKU: FBHK-KS116
Price: 61.37 USD
Availability: InStock

293 vehicles fit this part

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OE Direct Replacement — Bolt-on fit, no modifications needed

Fitment: Chevrolet, GMC, Hummer, Cadillac, Isuzu, Buick, and Pontiac, Silverado 3500 HD, Express 1500, Express 2500, Express 3500, Silverado 1500 Classic, Silverado 1500 HD Classic, Silverado 2500 HD, Silverado 2500 HD Classic, Silverado 3500 Classic, Savana 1500, Savana 2500, Savana 3500, Sierra 1500, Sierra 1500 HD Classic, Sierra 2500 HD, Sierra 2500 HD Classic, Sierra 3500 Classic, Sierra 3500 HD, H2, Escalade, Escalade ESV, Escalade EXT, Avalanche 1500, Silverado 1500, Silverado 1500 HD, Silverado 2500, Silverado 3500, Suburban 1500, Suburban 2500, Tahoe, Sierra 1500 HD, Sierra 3500, Yukon, Yukon XL 1500, Yukon XL 2500, CTS, Sonora, Ascender, Rainier, Corvette, SSR, Trailblazer EXT, Envoy XL, Envoy XUV, Sierra 2500, GTO, Camaro, Firebird, and L30

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Reliable Ignition Knock Sensor for Select GM and Isuzu Vehicles

The Standard Ignition KS116 Ignition Knock (Detonation) Sensor is designed to provide accurate knock detection for a range of Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, and Pontiac models. This sensor helps maintain engine performance by detecting detonation and allowing the engine control unit to adjust timing accordingly.

Screw-in mounting type with M10 x 1.5 thread size for secure installation
Bolt-on connector type with a round, male terminal for reliable electrical connection
No connector included, designed for direct screw-on attachment
Compatible with multiple GM and Isuzu vehicles including Chevrolet Silverado 1500, Cadillac Escalade, and GMC Sierra 2500 HD
Part number KS116 ensures proper fit and function for specified models

Technical Details and Compatibility

The KS116 ignition knock sensor from Standard Ignition features a screw-in attachment method with a precise M10 x 1.5 thread size, ensuring a secure and vibration-resistant fit. Its bolt-on connector type with a round shape and a single male terminal provides a straightforward installation without the need for additional connectors. This sensor is engineered to detect engine knock or detonation, allowing the vehicle’s engine control module to optimize ignition timing and prevent engine damage.

This sensor is compatible with a wide range of vehicles, including Buick Ascender, Cadillac CTS, Chevrolet Camaro, Corvette, and Silverado 1500 series, GMC Sierra 1500 and 2500 HD models, Hummer H2, Isuzu Ascender, and Pontiac GTO among others. The Standard Ignition KS116 is designed to meet OEM specifications for these vehicles, ensuring reliable performance and fitment.

Common Applications and Problem Resolution

Detects engine knock or detonation to prevent engine damage
Helps improve fuel efficiency by optimizing ignition timing
Resolves engine hesitation or pinging issues
Prevents check engine light triggers related to knock sensor faults
Maintains smooth engine operation under varying load conditions

Installation Notes and Tips

Installation of the Standard Ignition KS116 sensor requires a screw-in mounting using the M10 x 1.5 thread size. Ensure the mounting surface is clean and free of debris before installation. The sensor’s bolt-on connector type with a round, male terminal requires no additional connectors, simplifying the wiring process. Torque the sensor to manufacturer specifications to avoid damage or improper function. This sensor is designed for direct replacement on compatible Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, and Pontiac models.

Quality Assurance and Warranty

Standard Ignition parts are manufactured to meet or exceed OEM standards, providing dependable performance and durability. The KS116 ignition knock sensor undergoes rigorous quality control testing to ensure proper function and fitment. While specific warranty details may vary, Standard Ignition typically offers a limited warranty covering defects in material and workmanship to provide confidence in your purchase.

Brand	Standard Ignition
Part Number	KS116
Attachment Method	Screw-On
Connector Gender	No Connector
Connector Shape	Round
Connector Type	Bolt On
Mounting Type	Screw-in
Terminal Gender	Male
Thread Size	M10 x 1.5

This part fits 293 vehicles. Search below:

Year	Make	Model	Submodel	Liters	Cylinders	Fuel Type	Position	Notes
2008	Chevrolet	Silverado 3500 HD		6.0L	V8		N/A	1 Wire
2007	Chevrolet	Express 1500		5.3L	V8		N/A
2007	Chevrolet	Express 2500		4.8L	V8		N/A
2007	Chevrolet	Express 2500		6.0L	V8		N/A
2007	Chevrolet	Express 3500		6.0L	V8		N/A
2007	Chevrolet	Express 3500		4.8L	V8		N/A
2007	Chevrolet	Express 3500		5.3L	V8		N/A
2007	Chevrolet	Silverado 1500 Classic		6.0L	V8		N/A
2007	Chevrolet	Silverado 1500 Classic		5.3L	V8		N/A
2007	Chevrolet	Silverado 1500 Classic		4.8L	V8		N/A
2007	Chevrolet	Silverado 1500 HD Classic					N/A	1 Wire
2007	Chevrolet	Silverado 2500 HD		6.0L	V8		N/A	1 Wire
2007	Chevrolet	Silverado 2500 HD Classic		6.0L	V8		N/A	1 Wire
2007	Chevrolet	Silverado 3500 Classic		6.0L	V8		N/A	1 Wire
2007	Chevrolet	Silverado 3500 HD		6.0L	V8		N/A	1 Wire
2007	GMC	Savana 1500		5.3L	V8		N/A
2007	GMC	Savana 2500		4.8L	V8		N/A
2007	GMC	Savana 2500		6.0L	V8		N/A
2007	GMC	Savana 3500		6.0L	V8		N/A
2007	GMC	Savana 3500		4.8L	V8		N/A
2007	GMC	Sierra 1500		6.0L	V8		N/A	1 Wire
2007	GMC	Sierra 1500		4.8L	V8		N/A	1 Wire
2007	GMC	Sierra 1500		5.3L	V8		N/A	1 Wire
2007	GMC	Sierra 1500 HD Classic					N/A	1 Wire
2007	GMC	Sierra 2500 HD		6.0L	V8		N/A	1 Wire
2007	GMC	Sierra 2500 HD Classic		6.0L	V8		N/A	1 Wire
2007	GMC	Sierra 3500 Classic		6.0L	V8		N/A	1 Wire
2007	GMC	Sierra 3500 HD		6.0L	V8		N/A	1 Wire
2007	Hummer	H2		6.0L	V8		N/A
2006	Cadillac	Escalade		6.0L	V8		N/A
2006	Cadillac	Escalade ESV		6.0L	V8		N/A
2006	Cadillac	Escalade EXT		6.0L	V8		N/A
2006	Chevrolet	Avalanche 1500		5.3L	V8		N/A
2006	Chevrolet	Express 1500		5.3L	V8		N/A
2006	Chevrolet	Express 2500		6.0L	V8		N/A
2006	Chevrolet	Express 2500		4.8L	V8		N/A
2006	Chevrolet	Express 3500		6.0L	V8		N/A
2006	Chevrolet	Express 3500		4.8L	V8		N/A
2006	Chevrolet	Silverado 1500		6.0L	V8		N/A
2006	Chevrolet	Silverado 1500		4.8L	V8		N/A
2006	Chevrolet	Silverado 1500		5.3L	V8		N/A
2006	Chevrolet	Silverado 1500 HD		6.0L	V8		N/A
2006	Chevrolet	Silverado 2500		5.3L	V8		N/A
2006	Chevrolet	Silverado 2500 HD		6.0L	V8		N/A
2006	Chevrolet	Silverado 3500		6.0L	V8		N/A
2006	Chevrolet	Suburban 1500		6.0L	V8		N/A
2006	Chevrolet	Suburban 1500		5.3L	V8		N/A
2006	Chevrolet	Suburban 2500		6.0L	V8		N/A
2006	Chevrolet	Tahoe		5.3L	V8		N/A
2006	Chevrolet	Tahoe		4.8L	V8		N/A
2006	GMC	Savana 1500		5.3L	V8		N/A
2006	GMC	Savana 2500		6.0L	V8		N/A
2006	GMC	Savana 2500		4.8L	V8		N/A
2006	GMC	Savana 3500		6.0L	V8		N/A
2006	GMC	Savana 3500		4.8L	V8		N/A
2006	GMC	Sierra 1500		6.0L	V8		N/A
2006	GMC	Sierra 1500		5.3L	V8		N/A
2006	GMC	Sierra 1500		4.8L	V8		N/A
2006	GMC	Sierra 1500 HD		6.0L	V8		N/A
2006	GMC	Sierra 2500 HD		6.0L	V8		N/A
2006	GMC	Sierra 3500		6.0L	V8		N/A
2006	GMC	Yukon		5.3L	V8		N/A
2006	GMC	Yukon		4.8L	V8		N/A
2006	GMC	Yukon		6.0L	V8		N/A
2006	GMC	Yukon XL 1500		5.3L	V8		N/A
2006	GMC	Yukon XL 1500		6.0L	V8		N/A
2006	GMC	Yukon XL 2500		6.0L	V8		N/A
2006	Hummer	H2		6.0L	V8		N/A
2005	Cadillac	CTS		5.7L	V8		N/A
2005	Cadillac	Escalade					N/A
2005	Cadillac	Escalade ESV					N/A
2005	Cadillac	Escalade EXT					N/A
2005	Chevrolet	Avalanche 1500		5.3L	V8		N/A
2005	Chevrolet	Express 1500		5.3L	V8		N/A
2005	Chevrolet	Express 2500		6.0L	V8		N/A
2005	Chevrolet	Express 2500		5.3L	V8		N/A
2005	Chevrolet	Express 2500		4.8L	V8		N/A
2005	Chevrolet	Express 3500		6.0L	V8		N/A
2005	Chevrolet	Express 3500		5.3L	V8		N/A
2005	Chevrolet	Express 3500		4.8L	V8		N/A
2005	Chevrolet	Silverado 1500		4.8L	V8		N/A
2005	Chevrolet	Silverado 1500		5.3L	V8		N/A
2005	Chevrolet	Silverado 1500		6.0L	V8		N/A
2005	Chevrolet	Silverado 1500 HD		6.0L	V8		N/A
2005	Chevrolet	Silverado 2500					N/A
2005	Chevrolet	Silverado 2500 HD		6.0L	V8		N/A
2005	Chevrolet	Silverado 3500		6.0L	V8		N/A
2005	Chevrolet	Suburban 1500		5.3L	V8		N/A
2005	Chevrolet	Suburban 2500		6.0L	V8		N/A
2005	Chevrolet	Tahoe		4.8L	V8		N/A
2005	Chevrolet	Tahoe		5.3L	V8		N/A
2005	GMC	Savana 1500		5.3L	V8		N/A
2005	GMC	Savana 2500		6.0L	V8		N/A
2005	GMC	Savana 2500		5.3L	V8		N/A
2005	GMC	Savana 2500		4.8L	V8		N/A
2005	GMC	Savana 3500		6.0L	V8		N/A
2005	GMC	Savana 3500		4.8L	V8		N/A
2005	GMC	Sierra 1500		6.0L	V8		N/A
2005	GMC	Sierra 1500	Hybrid	5.3L	V8	ELECTRIC/GAS	N/A
2005	GMC	Sierra 1500		5.3L	V8	FLEX	N/A
2005	GMC	Sierra 1500		5.3L	V8	GAS	N/A
2005	GMC	Sierra 1500		4.8L	V8		N/A
2005	GMC	Sierra 1500 HD		6.0L	V8		N/A
2005	GMC	Sierra 2500 HD		6.0L	V8		N/A
2005	GMC	Sierra 3500		6.0L	V8		N/A
2005	GMC	Yukon		4.8L	V8		N/A
2005	GMC	Yukon		5.3L	V8		N/A
2005	GMC	Yukon		6.0L	V8		N/A
2005	GMC	Yukon XL 1500		5.3L	V8		N/A
2005	GMC	Yukon XL 1500		6.0L	V8		N/A
2005	GMC	Yukon XL 2500		6.0L	V8		N/A
2005	Hummer	H2		6.0L	V8		N/A
2005	Isuzu	Ascender		5.3L	V8		N/A
2004	Buick	Rainier		5.3L	V8		N/A
2004	Cadillac	CTS		5.7L	V8		N/A
2004	Cadillac	Escalade		6.0L	V8		N/A
2004	Cadillac	Escalade		5.3L	V8		N/A
2004	Cadillac	Escalade ESV		6.0L	V8		N/A
2004	Cadillac	Escalade EXT		6.0L	V8		N/A
2004	Chevrolet	Avalanche 1500		5.3L	V8		N/A
2004	Chevrolet	Corvette					N/A
2004	Chevrolet	Express 1500		5.3L	V8		N/A
2004	Chevrolet	Express 2500		6.0L	V8		N/A
2004	Chevrolet	Express 2500		5.3L	V8		N/A
2004	Chevrolet	Express 2500		4.8L	V8		N/A
2004	Chevrolet	Express 3500		6.0L	V8		N/A
2004	Chevrolet	Express 3500		5.3L	V8		N/A
2004	Chevrolet	Express 3500		4.8L	V8		N/A
2004	Chevrolet	Silverado 1500		5.3L	V8		N/A
2004	Chevrolet	Silverado 1500		4.8L	V8		N/A
2004	Chevrolet	Silverado 1500		6.0L	V8		N/A
2004	Chevrolet	Silverado 2500		6.0L	V8		N/A
2004	Chevrolet	Silverado 2500 HD		6.0L	V8		N/A
2004	Chevrolet	Silverado 3500		6.0L	V8		N/A
2004	Chevrolet	SSR		5.3L	V8		N/A
2004	Chevrolet	Suburban 1500		5.3L	V8		N/A
2004	Chevrolet	Suburban 2500		6.0L	V8		N/A
2004	Chevrolet	Tahoe		5.3L	V8		N/A
2004	Chevrolet	Tahoe		4.8L	V8		N/A
2004	Chevrolet	Trailblazer EXT		5.3L	V8		N/A
2004	GMC	Envoy XL		5.3L	V8		N/A
2004	GMC	Envoy XUV		5.3L	V8		N/A
2004	GMC	Savana 1500		5.3L	V8		N/A
2004	GMC	Savana 2500		6.0L	V8		N/A
2004	GMC	Savana 2500		5.3L	V8		N/A
2004	GMC	Savana 2500		4.8L	V8		N/A
2004	GMC	Savana 3500		6.0L	V8		N/A
2004	GMC	Savana 3500		4.8L	V8		N/A
2004	GMC	Sierra 1500		4.8L	V8		N/A
2004	GMC	Sierra 1500		5.3L	V8		N/A
2004	GMC	Sierra 1500		6.0L	V8		N/A
2004	GMC	Sierra 2500		6.0L	V8		N/A
2004	GMC	Sierra 2500 HD		6.0L	V8		N/A
2004	GMC	Sierra 3500		6.0L	V8		N/A
2004	GMC	Yukon		5.3L	V8		N/A
2004	GMC	Yukon		4.8L	V8		N/A
2004	GMC	Yukon XL 1500					N/A
2004	GMC	Yukon XL 2500		6.0L	V8		N/A
2004	Hummer	H2		6.0L	V8		N/A
2004	Isuzu	Ascender		5.3L	V8		N/A
2004	Isuzu	Ascender		4.2L	L6		N/A
2004	Pontiac	GTO		5.7L	V8		N/A
2003	Cadillac	Escalade					N/A
2003	Cadillac	Escalade ESV					N/A
2003	Cadillac	Escalade EXT					N/A
2003	Chevrolet	Avalanche 1500		5.3L	V8		N/A
2003	Chevrolet	Corvette					N/A
2003	Chevrolet	Express 1500		5.3L	V8		N/A
2003	Chevrolet	Express 2500		6.0L	V8		N/A
2003	Chevrolet	Express 2500		5.3L	V8		N/A
2003	Chevrolet	Express 2500		4.8L	V8		N/A
2003	Chevrolet	Express 3500		6.0L	V8		N/A
2003	Chevrolet	Express 3500		5.3L	V8		N/A
2003	Chevrolet	Express 3500		4.8L	V8		N/A
2003	Chevrolet	Silverado 1500		5.3L	V8		N/A
2003	Chevrolet	Silverado 1500		4.8L	V8		N/A
2003	Chevrolet	Silverado 1500		6.0L	V8		N/A
2003	Chevrolet	Silverado 1500 HD		6.0L	V8		N/A
2003	Chevrolet	Silverado 2500		6.0L	V8		N/A
2003	Chevrolet	Silverado 2500 HD		6.0L	V8		N/A
2003	Chevrolet	Silverado 3500		6.0L	V8		N/A
2003	Chevrolet	SSR		5.3L	V8		N/A
2003	Chevrolet	Suburban 1500		5.3L	V8		N/A
2003	Chevrolet	Suburban 2500		6.0L	V8		N/A
2003	Chevrolet	Tahoe					N/A
2003	Chevrolet	Trailblazer EXT		5.3L	V8		N/A
2003	GMC	Envoy XL		5.3L	V8		N/A
2003	GMC	Savana 1500		5.3L	V8		N/A
2003	GMC	Savana 2500		6.0L	V8		N/A
2003	GMC	Savana 2500		5.3L	V8		N/A
2003	GMC	Savana 2500		4.8L	V8		N/A
2003	GMC	Savana 3500		6.0L	V8		N/A
2003	GMC	Savana 3500		4.8L	V8		N/A
2003	GMC	Sierra 1500		5.3L	V8		N/A
2003	GMC	Sierra 1500		6.0L	V8		N/A
2003	GMC	Sierra 1500		4.8L	V8		N/A
2003	GMC	Sierra 1500 HD		6.0L	V8		N/A
2003	GMC	Sierra 2500		6.0L	V8		N/A
2003	GMC	Sierra 2500 HD		6.0L	V8		N/A
2003	GMC	Sierra 3500		6.0L	V8		N/A
2003	GMC	Yukon		5.3L	V8		N/A
2003	GMC	Yukon		6.0L	V8		N/A
2003	GMC	Yukon		4.8L	V8		N/A
2003	GMC	Yukon XL 1500					N/A
2003	GMC	Yukon XL 2500		6.0L	V8		N/A
2003	Hummer	H2		6.0L	V8		N/A
2003	Isuzu	Ascender		5.3L	V8		N/A
2002	Cadillac	Escalade					N/A
2002	Cadillac	Escalade EXT					N/A
2002	Chevrolet	Avalanche 1500		5.3L	V8		N/A
2002	Chevrolet	Camaro		5.7L	V8		N/A
2002	Chevrolet	Corvette					N/A
2002	Chevrolet	Silverado 1500		4.8L	V8		N/A
2002	Chevrolet	Silverado 1500		5.3L	V8		N/A
2002	Chevrolet	Silverado 1500 HD		6.0L	V8		N/A
2002	Chevrolet	Silverado 2500		6.0L	V8		N/A
2002	Chevrolet	Silverado 2500		5.3L	V8		N/A
2002	Chevrolet	Silverado 2500 HD		6.0L	V8		N/A
2002	Chevrolet	Silverado 3500		6.0L	V8		N/A
2002	Chevrolet	Suburban 1500		5.3L	V8		N/A
2002	Chevrolet	Suburban 2500		6.0L	V8		N/A
2002	Chevrolet	Tahoe					N/A
2002	GMC	Sierra 1500		4.8L	V8		N/A
2002	GMC	Sierra 1500		5.3L	V8		N/A
2002	GMC	Sierra 1500		6.0L	V8		N/A
2002	GMC	Sierra 1500 HD		6.0L	V8		N/A
2002	GMC	Sierra 2500		6.0L	V8		N/A
2002	GMC	Sierra 2500 HD		6.0L	V8		N/A
2002	GMC	Sierra 3500		6.0L	V8		N/A
2002	GMC	Yukon		4.8L	V8		N/A
2002	GMC	Yukon		5.3L	V8		N/A
2002	GMC	Yukon		6.0L	V8		N/A
2002	GMC	Yukon XL 1500					N/A
2002	GMC	Yukon XL 2500		6.0L	V8		N/A
2002	Pontiac	Firebird		5.7L	V8		N/A
2001	Chevrolet	Camaro		5.7L	V8		N/A
2001	Chevrolet	Corvette					N/A
2001	Chevrolet	Silverado 1500		5.3L	V8		N/A
2001	Chevrolet	Silverado 1500		4.8L	V8		N/A
2001	Chevrolet	Silverado 1500 HD		6.0L	V8		N/A
2001	Chevrolet	Silverado 2500		6.0L	V8		N/A
2001	Chevrolet	Silverado 2500		5.3L	V8		N/A
2001	Chevrolet	Silverado 2500 HD		6.0L	V8		N/A
2001	Chevrolet	Silverado 3500		6.0L	V8		N/A
2001	Chevrolet	Suburban 1500		5.3L	V8		N/A
2001	Chevrolet	Suburban 2500		6.0L	V8		N/A
2001	Chevrolet	Tahoe					N/A
2001	GMC	Sierra 1500		6.0L	V8		N/A
2001	GMC	Sierra 1500		5.3L	V8		N/A
2001	GMC	Sierra 1500		4.8L	V8		N/A
2001	GMC	Sierra 1500 HD		6.0L	V8		N/A
2001	GMC	Sierra 2500		6.0L	V8		N/A
2001	GMC	Sierra 2500 HD		6.0L	V8		N/A
2001	GMC	Sierra 3500		6.0L	V8		N/A
2001	GMC	Yukon		5.3L	V8		N/A
2001	GMC	Yukon		4.8L	V8		N/A
2001	GMC	Yukon		6.0L	V8		N/A
2001	GMC	Yukon XL 1500					N/A
2001	GMC	Yukon XL 2500		6.0L	V8		N/A
2001	Pontiac	Firebird		5.7L	V8		N/A
2000	Chevrolet	Camaro		5.7L	V8		N/A
2000	Chevrolet	Corvette					N/A
2000	Chevrolet	Silverado 1500		5.3L	V8		N/A
2000	Chevrolet	Silverado 1500		4.8L	V8		N/A
2000	Chevrolet	Silverado 2500		6.0L	V8		N/A
2000	Chevrolet	Silverado 2500		5.3L	V8		N/A
2000	Chevrolet	Suburban 1500		5.3L	V8		N/A
2000	Chevrolet	Suburban 2500		6.0L	V8		N/A
2000	Chevrolet	Tahoe		5.3L	V8		N/A
2000	Chevrolet	Tahoe		4.8L	V8		N/A
2000	GMC	Sierra 1500		4.8L	V8		N/A
2000	GMC	Sierra 1500		5.3L	V8		N/A
2000	GMC	Sierra 2500		6.0L	V8		N/A
2000	GMC	Sierra 2500		5.3L	V8		N/A
2000	GMC	Yukon		5.3L	V8		N/A
2000	GMC	Yukon		4.8L	V8		N/A
2000	GMC	Yukon XL 1500		5.3L	V8		N/A
2000	GMC	Yukon XL 2500		6.0L	V8		N/A
2000	Pontiac	Firebird		5.7L	V8		N/A
1999	Chevrolet	Camaro		5.7L	V8		N/A
1999	Chevrolet	Corvette					N/A
1999	Chevrolet	Silverado 1500		4.8L	V8		N/A
1999	Chevrolet	Silverado 1500		5.3L	V8		N/A
1999	Chevrolet	Silverado 2500		5.3L	V8		N/A
1999	Chevrolet	Silverado 2500		6.0L	V8		N/A
1999	GMC	Sierra 1500		4.8L	V8		N/A
1999	GMC	Sierra 1500		5.3L	V8		N/A
1999	GMC	Sierra 2500		5.3L	V8		N/A
1999	GMC	Sierra 2500		6.0L	V8		N/A
1999	Pontiac	Firebird		5.7L	V8		N/A
1998	Chevrolet	Camaro		5.7L	V8		N/A	1 Wire
1998	Chevrolet	Corvette					N/A	1 Wire
1998	Pontiac	Firebird		5.7L	V8		N/A	1 Wire

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

1045660312589867144-431158-14272-KS36242-10392KNC0025320015S217271-6541729267Q38104566030926-084AS10017DKS238DKS238SBKDSA1KS116TKS36S8696SBC3654SU1282VC

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.