Dorman 540-421 Suspension Stabilizer Bar Bushing Kit - Front

Dorman 540-421 Front Stabilizer Bar Bushings

Dorman 540-421 is a front suspension stabilizer bar bushing kit for select Mazda CX-9 models. Built as a standard replacement, it uses rubber/elastomer construction to restore sway bar support and help maintain consistent front-end suspension control.

• Direct replacement stabilizer bar bushing kit for select vehicles
• Rubber and elastomer material for OE-style fit and function
• Inside diameter: 32 mm
• Outside diameter: 51 mm
• Assembled length: 44.5 mm
• Bracket not included
• Grease fitting not included
• Fits front suspension applications

OE-Style Replacement Design

This Dorman suspension stabilizer bar bushing kit is precision-engineered and tested for reliable replacement on specific vehicles. It is built for the front sway bar on 2007-2015 Mazda CX-9 models and is intended to match the original equipment dimensions needed for proper bar support. Part number 540-421 is also referenced in aftermarket catalogs for the same application, including Mevotech Supreme MS76403.

Common Issues It Can Address

• Front suspension clunking or rattling from worn sway bar bushings
• Excessive play at the stabilizer bar mounting points
• Reduced front-end stability during cornering
• Noise caused by hardened, cracked, or compressed rubber bushings
• Uneven sway bar support on a Mazda CX-9 front suspension

Installation Notes

Verify the stabilizer bar diameter and mounting dimensions before installation. This kit is for front use on 2007-2015 Mazda CX-9 applications and does not include brackets or grease fittings. Clean the mounting surfaces thoroughly and inspect the sway bar and related hardware for wear before assembly. Part number 540-421 should be matched to the vehicle’s front suspension configuration before service.

Quality Assurance

Dorman manufactures this bushing kit as a standard replacement part and subjects it to engineering and testing checks to support dependable fit and function on the listed applications. For buyers searching for a front stabilizer bar bushing kit for 2007-2015 Mazda CX-9, Dorman 540-421 provides an OE-style service part built around the original dimensions.