BMW 6 Series E63/E64 (2003 - 2010) Rear Subframe Rear Mounting Insert - PFR5-721 This is an insert that fits into the voiding of the original bush to reduce movement. For a complete replacement bush, please use PFR5-722. - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!