BMW 3 Series G20, G21, G28, G80 (2018 on) Rear Diff Rear Mounting Bush - PFR5-4026BLK PFR5-4026 is a replacement bush that features a built-in support washer, providing further stability of the diff under acceleration. PFR5-4026 can also be used in conjunction with our PFR5-4030 dual-mount rear differential bracket to mount two bushes into the factory positions. Made using our signature Black 95A durometer polyurethane and Black anodised 2011-T6 aluminium, to reduce drivetrain deflection and the potential for wheel-hop during hard launches. PFR5-4026 bushes can be fitted with our PFR5-4030 dual-mount rear differential. - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!