Audi A8 / S8 A8 / S8 D4 (2010 - 2017) Rear Diff Front Bush Insert - PFR3-741 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!