Dorman 540-439 Suspension Stabilizer Bar Bushing Kit - Rear

Dorman 540-439 Rear Stabilizer Bar Bushings

Dorman 540-439 is a rear suspension stabilizer bar bushing kit engineered as a standard replacement for the original equipment on specific Mazda applications. It is built with rubber/elastomer material to help restore sway bar support and consistent rear suspension control on Mazda Miata, RX-7, and 626 models.

Key Features

• Direct replacement stabilizer bar bushings for rear suspension service
• Rubber/elastomer construction for OE-style fit and function
• Standard replacement grade for routine suspension repair
• Designed for specific bar diameters, including 12 mm and 19 mm rear bars where listed
• Bracket not included; grease fitting not included
• Cross-reference part numbers include Mevotech Supreme MK90626 and Monroe Shocks & Struts 172286

Detailed Description

This Dorman suspension stabilizer bar bushing kit, part number 540-439, is precision-engineered and tested to replace worn rear sway bar bushings on select Mazda vehicles. It is listed for 1986-1991 Mazda RX-7 rear applications with a 12 mm diameter bar, 1986-1987 Mazda 626 rear applications, and Mazda Miata rear applications across multiple years, including 1990-1991 models with a 12 mm diameter bar and 1992 models with a 19 mm diameter bar. For drivers searching for a rear stabilizer bar bushing kit for Mazda Miata or Mazda RX-7 suspension repair, 540-439 provides a direct-fit service part for the specified applications.

What It Helps Address

• Clunking or rattling from worn rear sway bar bushings
• Excessive play at the stabilizer bar mounting points
• Reduced rear suspension response from deteriorated rubber bushings
• Noise caused by hardened, cracked, or compressed original bushings
• Restoration of proper stabilizer bar support during cornering

Installation Notes and Tips

Verify rear stabilizer bar diameter before installation, since fitment varies by vehicle and bar size. This part is listed for rear position only and does not include a bracket or grease fitting. Confirm the vehicle year, make, model, and rear bar specification against the fitment data before service. Fits 1999-2005 Mazda Miata, rear; Fits 1990-1991 Mazda Miata, rear; Fits 1992 Mazda Miata, rear; Fits 1986-1991 Mazda RX-7, rear; Fits 1986-1987 Mazda 626, rear.

Quality Assurance

Dorman designs this replacement bushing kit to match the original equipment application on the listed vehicles and subjects it to testing for fit and function. Part number 540-439 is built as a standard replacement suspension component for service work on the specified Mazda rear stabilizer bar applications.