Audi A6 / S6 / RS6 A6 / S6 / RS6 C5 (1997-2005) Rear Diff Front Mounting Bush - PFR3-1131 PFR3-1131 includes a CNC machined aluminium outer shell to house the polyurethane bush for maximum control of the rear diff. - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!