Hello! this has been bugging be for a while now, but the triangular bits on the rear of the rear doors are all corroded up. I don't want to try to repair them myself, as it seems to have a delicate finish. Does anyone have any idea of where I could get a replacement from, other than Audi, how much do you reckon they cost and would it be easy to replace? I have looked but looks a little daunting. A pic of the bit I'm talking about is below; Cheers guys!