Rancho RS5000X Gas Shock Rear Pair 99-16 Ford F250 SD 4WD w/5-6" Lift Part Number RS55045 Rear pair of 2 shocks for vehicles w/5-6" rear Lift Fits 4WD vehicles All necessary washers, bushings, and nuts included. Factory shock mounting bolts are reused for installation. Rancho's limited lifetime warranty protects against defects and premature failure. Rancho's 90 day ride guarantee covers RS5000X, RS7000MT, and RS9000XL shocks.