This is the upper trunnion to control (shock) arm bushing made in polyurethane for an Austin Healey Sprite and MG Midget. One set is needed per car. Polyurethane bushes are the best compromise between standard rubber bushes and nylatron for daily driven street cars. They give improved suspension feel with greater wear resistance compared to their rubber equivalents and without the transmission of road noise and vibration suffered when fitting Nylatron style bushings. Another plus of the polyurethane bushings is that they are naturally self lubricating.