Prothane 4-1129-BL Rear Sway Bar Bushing Kit 16mm Black Polyurethane

The Prothane 4-1129-BL is a rear stabilizer bar bushing kit designed as a direct performance upgrade over factory rubber bushings. Engineered from Prothane's proprietary polyurethane compound, these bushings deliver firmer, more precise sway bar control — reducing body roll and improving overall handling response compared to soft OEM rubber units.

Each bushing features a grooved inner bore designed to retain Prothane's super grease, ensuring quiet, squeak-free operation throughout the life of the part. The black polyurethane formulation resists oils, solvents, and environmental degradation that cause premature wear in stock rubber bushings.

Key Features:

• 16mm bore diameter — matches OEM rear stabilizer bar size
• Manufactured from Prothane's performance-grade polyurethane compound
• Grooved bore retains grease for quiet, long-lasting operation
• Black finish; also available in red (part 4-1129)
• Fits 2WD and 4WD applications
• Direct OEM replacement — no modifications required
• Resists oil, ozone, and UV degradation

Upgrading to polyurethane sway bar bushings is one of the most cost-effective suspension improvements available, restoring — and often exceeding — the handling performance of a new or larger diameter sway bar without the added expense.