This control arm is also referred to as a transverse link, it is the one that goes straight across left right, with one end attached to the steering knuckle through a ball joint and the other end has a rubber bushing (203-333-09-14) attaching this arm to the subframe. The photo is of the inner aluminium sleeve of this bushing assembly, the sleeve has been separated from the rest of the bushing assembly.

This sleeve has an elongated hole, with four ridges inside, as you can see in the photo.. The bolt which anchors the bushing only fits in the middle of this sleeve, located by the four ridges. Apparently the ridges are used for camber adjustment. How does that work? Do you grind off two ridges so that the bolt can move sideways in the elongated hole?