When installing Deaver leaf springs or just removing the factory block, you need to relocate the factory rubber bump stop so that you don't bottom out the shock before the suspension. Now with this spacer installed the bump stop will contact the housing correctly and keep you from damaging the shocks. We CNC machine these in-house from 6061 aluminum, then have them bead blasted, anodized and laser etched. We include the necessary metric hardware.