BMW 2 Series F87 M2 Coupe (2015 - 2021) Rear Diff Front Mounting Bush - PFR5-4025BLK PFR5-4025 is a replacement bush that includes aluminium sleeves with built-in support to increase control of rear diff movement and replaces all four bushes in the original rear diff front mounting bracket. - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!