Prothane 14-1125-BL Rear Sway Bar Bushing Kit 21mm Black Polyurethane

The Prothane 14-1125-BL is a premium polyurethane rear sway bar bushing kit designed as a direct performance upgrade over factory rubber stabilizer bar bushings. Engineered for the Nissan 350Z and Infiniti G35, this kit fits a 21mm rear sway bar and is finished in black.

Stock rubber sway bar bushings are designed primarily to absorb vibration, not to grip the sway bar firmly. Over time, they flex, wear out, and allow the bar to shift — reducing its ability to control body roll and maintain rear wheel traction in turns. Prothane's polyurethane compound does not flex like rubber, gripping the sway bar more firmly and maintaining that grip for the life of the vehicle.

Key Features:

• 21mm bore diameter — precision-fit for OEM sway bar diameter
• Premium polyurethane construction — significantly firmer and more durable than OEM rubber bushings
• Grooved inner bore — designed to retain Prothane Super Grease for smooth, quiet operation
• Black color — includes a small amount of graphite mixed into the polyurethane, which may help reduce squeaking
• Reduces body roll — firmer bushing grip delivers handling performance comparable to installing a larger diameter sway bar
• Improves traction and tire wear — keeps the rear contact patch flat during cornering for more even, consistent grip
• Resistant to road salt, grime, and weathering — polyurethane outlasts rubber in real-world driving conditions
• Lifetime warranty — Prothane guarantees these bushings against defects in materials and workmanship for the life of original ownership

Installation requires proper lubrication with Prothane Super Grease (sold separately) applied to the grooved bore at the time of install to ensure quiet, squeak-free operation. This kit is the black variant of the 14-1125 series, also available in red (14-1125).