Millway | Rear Trailing Arm Bushing (RTAB) – BMW E36, E46, Z4, M3 | Track UpgradeControl arm bushing for the rear trailing arm. Made of aluminum with bearings of the highest quality. Extremely durable bushing that prevents flex in the mounts, thus changing wheel angles. Provides a much more solid feel to the rear suspension and a safer behavior. This bushing replaces the original rubber bushings, which is a very weak part on track cars. Supplied with threaded locking ring to secure the bushing position in the arm. Price for 2