Synergy Manufacturing 8058-40 Suspension Multi Purpose Bump Stop Jeep JK Rear Bump Stop Spacer Kit (4.0'' Pair) Synergy Jeep JK Rear Bump Stop Spacer Kit Description: 4" Jeep JK Rear Bump Stop Spacers (Pair) Recommended for Tire Sizes: 37" (42" w/ fender flares & proper bump stop spacers)