Audi A6 / S6 / RS6 A6 / S6 / RS6 C7 (2011 - 2018) Rear Diff Front Bush Insert - PFR3-741BLK This is an insert to fit into the original bush to minimise the movement of the diff under acceleration. - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!