Monroe 39131 Suspension Shock Absorber - Front Right

Monroe OESpectrum Monotube Shock Absorber 39131

Monroe OESpectrum Monotube Shock Absorber 39131 is built for vehicles originally equipped with a monotube shock design. It is engineered to improve handling precision and control while filtering out noise, vibration, and harshness for a more refined ride.

Compatible with 2006-2015 Lexus IS250 and 2006-2015 Lexus IS350 front right applications, this Monroe shock absorber is a direct-fit suspension service part for the Lexus IS platform. The 39131 part number is also a useful reference when comparing OE-style replacement options for the same front-right position.

Key Features

• Monotube shock absorber design for OE-style suspension service
• Front right fitment for Lexus IS250 and Lexus IS350 applications
• Helps improve handling response and steering control
• Filters road noise, vibration, and harshness for a smoother ride feel
• Upper mount: stem mount with M12 thread pitch
• Lower mount: loop bushing and sleeve mount with 14 mm sleeve ID
• Compressed length: 17.34 in; extended length: 20.79 in; travel length: 3.45 in

Product Details

Monroe’s OESpectrum Monotube Shock Absorber line is made for vehicles that use a monotube shock configuration from the factory. This design focuses on controlled damping and consistent road feel, making it a practical choice for restoring suspension performance on the Lexus IS250 and Lexus IS350. Part number 39131 is specified for the front right position and uses a stem upper mount with an LS43 lower loop-bushing mount.

This part cross-references Focus Auto Parts 345774R for the same application.

What It Helps Address

• Excessive bouncing or reduced damping control
• Harsh ride feel over uneven pavement
• Noise and vibration coming through the suspension
• Loose or less responsive front-end handling
• Wear-related loss of shock absorber performance

Installation Notes

• Verify front right placement before installation.
• Confirm stem and loop-bushing mount dimensions match the vehicle’s original setup.
• Inspect surrounding suspension components, including bushings and mounts, during replacement.
• Use the vehicle’s service procedure and torque specifications for final assembly.

Quality Assurance

Monroe designs the OESpectrum Monotube line for OE-style suspension service on vehicles equipped with monotube shocks from the factory. The 39131 shock absorber is built to support controlled handling and reduced NVH on the Lexus IS250 and Lexus IS350 front right position.