Sixity Auto 2005-2014 Ford F-350 Super Duty 2.5" Front Full Leveling Lift Kit 2.5in Suspension CNC Machined from Aerospace Grade Billet Aluminum. Much stronger than poly lift spacers, and will not crack over time like welded steel spacers. Can be installed in only a few hours. No cutting or welding required, and no need to disassemble your existing struts or coils. Note: Due to suspension geometry, lift spacer thickness is NOT the same as the vehicle lift height.