These heavy duty HCR Race links follow the same design as the standard radius rods with material increased to .120 wall tubing. The 5/8-18 heims are available in Right hand or left hand combinations for adjustable or non - adjustable link preferences. Kit Includes 2 Upper Radius Rods & 2 Lower Radius Rods and needed hardware. Includes Standard Back Brace 7/16 HD Backplate Upgrade Tired of losing your rear end to a bolt? Never again with this Heavy Duty Back Plate Setup. This double shear system with upgraded bolts eliminates horizontal movement due to lose / stretched bolts allowing the factory bolt to shear. 7/16" ID Setup Includes Upper and Lower Brace tab to weld onto the Frame for double shear design. These tabs will be shipped lose at back plate needs to be installed and tabs tacked for individual alignment before welding. 7/16 ID F 911 Grade 9 Aircraft Bolts larger misalignment spacers or crush sleeves to use with larger diameter bolt Please note factory bolt holes on frame will need to be drilled out to 7/16" ID to accommodate larger Setup.