Includes Pressed-In Bushing & Ball Joint for Ease of Install **Referred to as a wishbone, should be replaced in matched pairs** Control arms are a common wear item on most vehicles and your BMW is no exception. Worn control arms cause cause a variety of undesirable performance issues as well as alignment problems. Generally speaking if the inner bushing has developed play or if the outer ball joint boot has torn the control arm will need to be replaced. FCP recommend replacing control arms in matched pairs.