New for 2025, we are offering a bolt-in kit instead of the older weld-in kit. Convert the ball joints in your E36 and E46 rear trailing arms to PTFE lined spherical bearings. This kit is for the two connections of the upper and lower control arms to the trailing arms (Forward "RTAB" bearing conversion sold separately). Remove your stock plasic lined ball joints from the trailing arms. Install our new bearing housings by applying green Locktite Bearing Compound to the outer diameter of the housing and slide the new housings into the trailing arms. Secure the housings into the arms by installing the included locking rings to the threaded end of the housing along with Red Locktite. Now your upper and lower control arms will pivot smoothly throughout your suspension stoke without play and without binding, resulting in more consistent and direct feel. Kit includes 4 steel housings with PTFE spherical bearings already inserted, 4 lock rings for installation, and 8 steel bearing side spacers to adapt your upper and lower arms to the bearings.