Once installed, this black rear sway bar bushing kit provides better handling and control of your Wrangler for a better overall performance. Each bushing is made of polyurethane which is a stronger replacement than rubber and lasts for as long as you need it! Bolt-on application for a direct fit and easy installation.. This black polyurethane rear sway bar bushing kit from Prothane fits 97-06 Jeep Wrangler with a 13mm sway bar diameter.