**Referred to as a wishbone, a common wear item on high mileage suspensions** This control arm, often referred to as a "lower control arm" has two common failures. The inner bushing which is designed to twist and rotate will tear and fail. This normally causes a shimmy at speed. Also, the ball joint boot rubber will crack and tear which will cause almost immediate failure of the ball joint as water and dust are allowed to enter the joint. LEM-3048601 does not come with the self locking nut and will need to be purchased separately. The p/n for the self locking nuts is: 31106769443.