The range rover 6 piston brembo requires the the mounting insert to be removed from the caliper and then place a blank one in its place. Once in place you drill the blank insert to the dimensions of the BMW X5 caliper hub mount. Use a set of caliper bolts 12mm longer than the original and then mount up. I a cannot take credit for the using the rover calipers that credit goes to another board member" ilias051266" He did this upgrade first.