BMW 3 Series F30, F31, F34, F80 (2011 - 2018) 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!