Application : 2004-2020 Ford F-150 2WD/4WD Description: The thickness of front spacer is About 1.65 inch/ 42 mm, but it can lift front 2.5 inch The Rear Block is 3'' thickness 2004-2008 4WD has 2'' stock block, it will provide 1'' additional 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. .