BMW X Series X6 Series Rear Subframe Rear Bush Insert - PFR5-1423 This is an Insert and fits into the original bush which reduces the subframe movement. This Insert does not fit the E70 X5 M or E71 X6 M models. - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!