Replaces worn rubber bushings and cracked plastic parts. Well designed and durable, I'm sure unlike rubber they will last a lifetime. Fits my 1992 F350 Dual 2wd with 460 engine. Note: This part has nothing to do with Moog bushings. If your radius arms don't go 100% straight into these bushings, these bushings are stiff enough to break the alignment, so buy the right angle bushings or cut them down for proper alignment. Ford designed these trucks to have so many areas that could break alignment,