The Hardrace reinforced trailing arm features high strength and lightweight aluminum alloy construction. It provides greater longitudinal structural strength over the factory stamped steel type trailing arms to resist movement of suspension generated during acceleration and braking, offering better traction under acceleration and corner exit. The trailing arm is also equipped with pillow ball bearings to provide firmer handling response and greater flexibility for alignment settings over the factory rubber bushings.. Lightweight CNC aluminum alloy construction. Premium quality pillow ball bushings equipped. Increase suspension rigidity. Improve traction and handling response. Direct bolt-on fitment  Note: CNC Aluminum Body Pillow Ball Equipped 4 PCS/SET  Fits: Toyota Yaris / vitz GR GXPA16/MXPA12, 2020-present Toyota Corolla/altis/auris GR GZEA14 2022-present