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The Prothane rear frame shackle bushings with 1 3/8-inch outer diameter for 1981–1987 GM vehicles are direct replacements designed to fit rear shackle mounts and preserve spring positioning and suspension geometry. Finished in red for quick identification, they serve as service parts for owners maintaining period-correct rear suspension fit. These bushings are intended for 1981–1987 GM rear shackle applications requiring a 1 3/8-inch OD bushing.
Prothane 81-87 GM Rear 1 3/8in OD Frame Shackle Bushings - Red
