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The Prothane rear spring and shackle bushing kit for 1973–1987 GM rear suspensions includes 1.50-inch bushings in black polyurethane to replace worn rubber components. It provides firmer spring support and helps maintain spring alignment and suspension geometry in rear applications. This kit is specified for GM rear spring and shackle setups from 1973 through 1987 and lists the bushing diameter as 1.5 inches.
Prothane 73-87 GM Rear Spring & Shackle Bushings (w/ 1.5in Bushings) - Black
