The Prothane rear spring and shackle bushing kit for 1981-1987 GM K30 trucks replaces factory rear spring and shackle bushings and includes a 1 3/8-inch outer-diameter frame shackle bushing. Finished in black, this set is specified for K30 rear suspension use and provides a direct replacement bushing option where that OD frame shackle bush is required.

Prothane 81-87 GM K30 Rear Spring & Shackle Bushings (w/ 1 3/8in OD Frame Shackle Bush) - Black