ReadyLIFT OEM-style rear block kits are available for model-specific applications. These Rear Block Kits include two (2) Rear Blocks, four (4) E-Coated U-Bolts, and eight (8) Nuts and Washers. Based on OEM designs and never made out of lightweight extrusions, ReadyLIFT GM Blocks are made from cast iron and have built-in anti-rotation ears.