Audi A4 / S4 / RS4 A4 / S4 / RS4 B8 (2008-2016) Rear Anti Roll Bar Bush 21.7mm 21.7mm - PFR85-515-21.7 Please check anti roll bar diameter before ordering - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!