This set includes 4 pieces PU polyurethane bushings for the rear axle of X5 E53 For Models from Year 2000-2006 & X6 E71 E72 for models from Year 2008-2014. These bushings are compatible with part numbers 33316770454 and 33311093662. They are designed to replace the original rubber bushings in the subframe and control arms. The installation process involves reusing the original hardware like bolts. To install, remove the old rubber bushings from the subframe and clean the area. Apply lubrication to both the bushings and the outer part of the metal sleeve. Begin by inserting the lower and upper parts of the PU bushings, followed by the metal sleeve. The insert pipe, featuring an elevated center circle, should be oriented upwards toward the vehicle. Additionally, place the original metal support washer above the bushing and then press the bushing into the circular metal housing. This process ensures a proper fit and function of the new bushings, enhancing the vehicle's stability and handling. The polyurethane material and aluminum insert contribute to the durability and performance of these bushings, maintaining the vehicle's handling characteristics consistent with the original specifications.