Audi A6 / S6 / RS6 A6 / S6 / RS6 C7 (2011 - 2018) Rear Diff Rear Bush Insert - PFR3-743BLK This is an insert that fits into and fills the original voids in the original bush. - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!