This ball joint connects from the spindle reinforcement plate to the front lower control arm. Although a small and relatively simple part, a worn ball joint can have a big effect on how your X5 performs and reacts. If you notice an 'echo' through the steering wheel after hitting a bump, there's a good chance it can be traced back to a worn ball joint. Replace yours with this brand-new part to restore handling back to your BMW. Fits both left and right positions.