The Prothane rear spring and shackle bushing kit for 1981–1987 GM K30 trucks is supplied in red and includes a frame shackle bushing sized at 1.5" outside diameter. This kit replaces worn rubber bushings at the rear spring and shackle locations to restore proper mounting geometry. It’s intended as a like-for-like replacement for the K30 applications listed in the description.
Prothane 81-87 GM K30 Rear Spring & Shackle Bushings (w/ 1.5in OD Frame Shackle Bush) - Red