Information High quality chassis partseries products. Made with high strength steel tubing for superior strength and durability. Stable performance, reliable quality and long service life Uniform thickness, no blow holes, slag, cracks, tearing, or incomplete fusion. Measured by specialized inspection tools after welding to make sure assemble hole , bushings insert, and installation sizes are proper. Professional InstallerisHighly Recommended(No Instruction Included) Alignment Highly Recommended After InstallCompatibility Chart For 1962-1982 Chevy/GMC 1/2 Ton For 1967-1981 Chevy Blazer 1/2 Ton Full-Size For 1967-1981 GMC Jimmy 1/2 Ton Full-Size Some of the above models were equipped with 10 bolt differentials, please compare to your existing cover before ordering.Package Content 1x Aluminum Differential Rear End Cover with Gasket , Drain Plug Bolt W/o Product Instruction