RockJock's front bump stop kit for Jeep TJ Wrangler and LJ Unlimited vehicles, as well as all XJ, MJ and ZJ, extends the top and bottom bump stop impact points the necessary amount for a 4 in. lift. These quality polyurethane bump stops and aluminum spacers fit inside the coil spring top and bottom. Additionally, this kit positively retains the coil spring to the differential housing. This is a set for the front end only.