Prothane rear spring and shackle bushings for 1973–1987 GM applications are supplied as black 1.75-inch bushings specified for rear spring and shackle use. The listing notes the 1.75in bushing size and the 1973–1987 GM fitment range; confirm those dimensions and your vehicle's year before selecting these black bushings for rear spring and shackle replacement.
Prothane 73-87 GM Rear Spring & Shackle Bushings (w/ 1.75in Bushings) - Black