2004-2019 Ford F150 2WD/4WD (To be used with factory blocks. Includes longer U-bolts). Rear 1.0" Block Kit. PN 5-5001. RTX Off Road1 Inch rear block kit for 2004-2019Ford F150 2WD & 4WD trucks. Comes complete with vehicle specific u-bolts and hardware. Adds a nice rake for towing or hauling additional weight in the bed. Easy to install. Safely raises trucks 1 inch. Does not require any permanent modifications