Prothane rear spring and shackle bushings for 1973–1987 GM applications are supplied as red 1.75-inch bushings listed for rear spring and shackle use. The listing specifies 1.75in bushings and the applicable GM year range, so match these dimensions and the 1973–1987 fitment to your vehicle when replacing rear spring and shackle bushings.
Prothane 73-87 GM Rear Spring & Shackle Bushings (w/ 1.75in Bushings) - Red