Prothane 11-42059-BL Front Sway Bar Bushing Kit Black 21mm Polyurethane

The Prothane 11-42059-BL is a front sway bar bushing kit designed for Jaguar XJ12, XJS, and XKE V12 applications. Engineered from Prothane's performance-grade polyurethane compound, these bushings deliver a firm, precise hold on the stabilizer bar that stock rubber simply cannot match — reducing body roll, improving cornering response, and restoring crisp handling feel.

Unlike soft OEM rubber bushings that degrade over time and allow excess sway bar movement, Prothane's polyurethane formula maintains its shape and grip under repeated stress. Each bushing features a grooved bore specifically designed to retain Prothane Super Grease, ensuring quiet, squeak-free operation throughout the service life of the part.

Key Features:

• Precision-fit polyurethane construction for a firmer, more responsive stabilizer bar mount
• Grooved bore retains Prothane Super Grease for quiet, long-lasting operation
• 21mm bar diameter fitment
• Black (BL) finish
• Front sway bar / stabilizer bar application
• Available in black or red colorways
• Significantly more durable than OEM rubber bushings

This kit is the direct-fit polyurethane upgrade for the front anti-roll bar on classic Jaguar XJ12, XJS, and XKE V12 platforms. Prothane's sway bar bushing line covers a wide range of bar diameters, including options for larger-diameter high-performance sway bars.