KYB SB112 Suspension Strut Bellows - Front or Rear

KYB Strut Boot Kit SB112

Protect the strut shaft and sealing surfaces on compatible BMW and other import applications with the KYB SB112 strut boot kit. This KYB Boot Kit is built to shield the polished shaft from dirt, dust, sand, salt, and road debris while adding a travel-limiting bumper to help prevent bottoming out.

Designed for front and rear suspension service where listed, the SB112 follows OE-style fit and function for direct replacement use on many BMW 3 Series, 5 Series, 7 Series, X5, and M models, along with select Toyota, Mazda, Audi, Subaru, and other vehicles.

Key Features

• Superior-quality bellows help protect the strut shaft from leak-causing dirt and debris
• Poly foam bumper helps prevent the strut from bottoming out
• Protects the upper seal and bushing from abrasive contamination
• Built to match or exceed OE design and quality
• Designed and built specifically for BMW applications

Product Details

KYB Boot Kits are made to cover the full strut shaft with a durable plastic bellows, reducing exposure to contaminants that can accelerate wear on the shaft, upper seal, and bushing. The included poly foam bumper adds impact protection during suspension compression, helping reduce damage from extreme movement. This part number, SB112, is a practical choice for drivers servicing a BMW 328i front strut boot, a Toyota Corolla front suspension strut bellows replacement, or other listed applications where OE-style protection is needed.

This part cross-references Monroe Shocks & Struts 63631 for the same application.

Common Problems It Helps Address

• Dirty or damaged strut shafts exposed to road debris
• Premature seal wear from dust, salt, and sand intrusion
• Suspension noise or harshness caused by worn bump stops
• Bottoming-out damage during heavy compression events
• Reduced protection after strut service or replacement

Installation Notes and Fitment Tips

Fits 2014-2019 Toyota Corolla, front; 2016-2018 Fiat 500X, front; 2014-2017 Mazda 6, front; 2016-2017 Mazda CX-3, front; 2012-2017 Toyota Prius V, front; 2017 Toyota Yaris iA, front; 2015-2016 Audi Q3, front; 2015-2016 Audi Q3 Quattro, front; 2008-2016 Mitsubishi Lancer, front; 2016 Scion iA, front; 2011-2016 Scion tC, front; 2011-2015 Mitsubishi Outlander Sport, front; 2010-2015 Toyota Prius, front; 2012-2015 Toyota Prius Plug-In, front; 2008-2014 Subaru Tribeca, rear; and additional listed BMW applications.

• Verify suspension type before ordering; several BMW applications exclude Sport Suspension, M-Technik, EDC, or electronic suspension systems.
• Confirm front or rear position exactly as listed for your vehicle.
• Inspect the strut shaft, seal, and bushing during service and replace worn components as needed.
• Use the vehicle-specific notes for BMW fitment, especially on E36, E46, E39, E60, E65/E66, and E38 chassis applications.

Quality Assurance

KYB manufactures suspension components with OE-style design and quality standards, and the SB112 is engineered to match or exceed original equipment expectations for listed applications. For BMW strut boot replacement and other compatible import suspension service, this KYB Boot Kit provides targeted protection for the strut assembly.