RockJock's front bump stop kit for 1997-2006 Jeep TJ Wranglers and Unlimiteds, as well as all XJ's and MJ's, extends the top and bottom bump stop impact points the necessary amount for a 4" 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.