Rancho RS5000 Hydro Shocks Set 1980-1996 Ford F-150 4WD w/Quad Front Set of 4 Shocks - Fits 4WD Vehicles w/Quad Front Shock boots included with all shocks. Hydraulic damping and velocity-sensitive valving generate a damping force proportional to the velocity of compression or extension of the shock. Slow compression provides low resistance fast compression provides greater resistance. 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.