Synergy Rear Coil Spring Wedges for Jeep Wrangler JK address issues with ride quality after lifting/stretching wheelbase. On a lifted vehicle it is common for rear springs to rub or contact rear trackbar resulting in bowing. Keep your coils straight and maintain a quality, smooth ride with coil wedges.Made of high-density polyurethane, and they maintain the factory ride quality. These install underneath the stop spring, and installation can be considered easy with no welding, no cutting, or no drilling.Kit Includes:- One (1) pair of rear coil wedgesKeeps rear springs from bowing irregularly when suspension lifts are usedFixes the frequent problem of the rear springs rubbing the rear trackbar/trackbar bracket when aftermarket CV driveshafts are usedCorrects the rear axle mount spring perch angle when aftermarket CV driveshafts are usedCorrection: 10 DegreesSold in PairsMade in USAFits:Jeep Wrangler JK 2 Door (2007-2018)Jeep Wrangler JK 4 Door Unlimited (2007-2018)