Audi A4 / S4 / RS4 A4 / S4 / RS4 B8 (2008-2016) Rear Subframe Front Bush - PFR3-730 This is a replacement bush, for an insert that fits into the original bush OE number: 8K0505145B please use PFR3-731, for an insert to fit the original bush OE number: 4G0505145B please use PFR3-737. - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!