Thrust arms on the front are common "consumables". Get Lemforders, don't buy the no name stuff. You can replace the bushing on it's own, but I suggest doing the whole arm since it's not much more (part cost and labor).
Alternators on 540's are expensive as well, and don't last forever (they're water cooled).
and more of a cosmetic thing, the pixels tend to go in the cluster on the info display.
Oh, and cup holders break often
don't use them.