BMW 1 Series F20, F21 xDrive (2011 - 2019) Front Control Arm To Chassis Bush - PFF5-4102 PFF5-4102 is a reinforced replacement part that is 8% stiffer than the original bush to revitalise bush performance and restore steering precision. - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!