Rancho Rs5000 Dual Steering Stabilizer + Mounts 99-04 Ford F-350 Super Duty 4WD Part Number RS98509 Dual Steering Stabilizer Kit; Incl. RS6553 or RS6653 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.