18-Up Wrangler JL IR Bushing Replacement Kit 8 Short Arms TeraFlexUse the TeraFlex JL: 8 Short Arm IR Bushing Replacement Kit to upgrade your existing adjustable Alpine Short Control Arms on your JL Wrangler Unlimited to the same bushings as our new adjustable Alpine IR Short Control Arms. Can also be used to replace existing IR bushings. After years of testing, TeraFlex has perfected our all new IR (Independent Rotation) Bushings. These innovative bushings are included in our in our new Alpine IR Long Short Control