The stock bushings wear out easily on our BMW. Save yourself the headache and pick up a pair of these trailing are bushing replacements which use chromoly spherical bearings that are known to outlast and out perform any other. The stock bushings are tapered and our design is also tapered and directional. These are made to fit tightly and best to put them in the freezer to shrink the size slightly before installing. Use the set screws to securely hold in place and torque them 10 to 14 ft/lbs.