This Spicer ball joint set fits Jeep Dana 30 and Dana 44 axles in Jeep JK Wranglers. The ball joint is installed in an inverted position on the inner "C" of the axle housing. The kit includes both the upper and lower joints and the hardware for one side. Please note that these ball joints only fit 2007 and newer Jeep Wranglers. All other years of Jeeps use different parts that are found in separate listings.