BMW 4 Series F32, F33, F36, F82, F83 (2013 - 2020) Rear Subframe Rear Bush Insert - PFR5-1921 This is an insert that fits into voids in the original bush to reduce subframe movement. - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!