"D" shaped mount bushing, locates at attaching point on underbody for rear anti-sway bar. Fits Opel GT and some Kadett B models. Note: For optimal fitment, first measure diameter of bar you have (so you can specify size you need): Stock Opel rear sway bars used thin 9/16" bushings, while older-style aftermarket bars used 5/8" bushings. Opel GT Source rear sway bars use the largest-sized 3/4" rear bushings.