Bilstein 5100 Monotube Gas Shock Rear Pair 2009-2013 Ford F150 4WD Part Number 33-187501 Rear pair of 2 shocks for vehicles at factory height or w/0-2" rear Lift Fits 4WD vehicles All necessary washers, bushings, and nuts included. Factory shock mounting bolts are reused for installation. Bilstein's Limited Lifetime manufacturer's Warranty protects against defects and premature failure.