Prothane 12-401-BL Sway Bar End Link Bushing Kit Black Polyurethane - Front

The Prothane 12-401-BL is a front sway bar end link bushing kit engineered as a high-performance polyurethane upgrade over factory rubber bushings. End links are the critical connection between your sway bar and the suspension control arms — when these bushings wear out, handling precision degrades, body roll increases, and clunking noises become common. This kit restores and improves that connection with durable polyurethane construction.

Key Features:

• Polyurethane construction — significantly more durable than OEM rubber, resists wear, compression, and deflection over time
• Black color (BL) — contains a small amount of graphite blended into the polyurethane compound, which aids in reducing squeaking at installation
• Includes all necessary hardware — kit comes with new bushings, hardware, and pre-lube for proper installation
• Direct OEM replacement fit — designed specifically for the front end link positions on the 1986–1988 Mazda RX-7
• Lifetime warranty — Prothane backs this product against defects in materials and workmanship for the life of the original purchaser's ownership of the vehicle
• Made in the USA — manufactured by Prothane, a division of DEE Engineering, Inc., based in Ontario, CA

Upgrading to polyurethane end link bushings reduces unwanted flex and slop in the front stabilizer bar linkage, resulting in sharper turn-in response, reduced body roll, and improved overall chassis feedback. The black variants include graphite in the formulation for added squeak resistance, though proper greasing with the included pre-lube at installation is always recommended regardless of color. This kit is the black (-BL) version of Prothane part number 12-401.