Normally i'd have said leave them yellow but looking at your photo's i've changed my mind as the anthracite seems to make the mirrors unobvious and a smoother look.
If you could spray the mirror mount triangle yellow that may look good with yellow mirrors?
Bloody hell - just noticed I need some air in my tyre!
The wing mirrors were just covered in anthracite vinyl and it went down perfectly if I do say so myself (been doing it 12 years so it bloody should have) just wanted to see if it looked good and now I can't decide to have them sprayed permanently!
The only thing putting me off is that I nicked the idea off Seat...