For:For 2004-2008 Ford F-150 4WD Only NOT Recommended For FX4 Based Models - 3" Or 3.5" Front Lift May Cause Contact Between The UCA and Coil SpringWill NOT Fit 2004 Heritage ModelsWill NOT Fit Ford Raptor2021+ New Models may has Round U bolts, will NOT fit our Square U bolts.The Thickness of Rear Block is appr. 3 inch (76mm).2004-2008 4WD has 2" stock block, it will provide additional 1" lift.2009-2020 4WD has 1.5" stock block, it will provide additional 1.5" lift.2004-2020 2WD has NO stock block, it will provide additional 3" lift.Does not level the truck !!!-It's not absolute.It depends on the difference between the front height and the rear height of the car. Package:2x Front Strut Spacers + 2x Rear Blocks.