2x Rear Coil Lift SpacersInstallation instructions Note: Fits 6-Lug Models Only. 2007-2020 version : Does Not work with Automatic Load-Leveling SuspensionOur Supreme rear coil spacers are precision engineered to lift and level your truck with ease. Our rear coil spacers are CNC machined from either solid 6061 T6 billet aluminum and anodized black or our special Delrin thermoplastic. We use Delrin and Billet specifically for our precision parts requiring high stiffness, low friction and excellent dimensional stability. Unlike polyurethane style spacers, our rear spacers will not dry up and will maintain a proper lift amount for the life of your vehicle.NOTES: An alignment is always recommended after altering the height of your vehicle.