OK, I have been hunting this down myself for some time now......do a search both here and in the S5 forum for the other threads for part numbers and such.
Up until now, I was under the impression that the "aluminum" S5 and B8 S4 mirror caps were to be the same, and an exact fit for the B8 A4.
Not real aluminum, but a faux treatment. They are a deeper silver/aluminum color, with almost a bit of a clear coat over them make them shine more in the light.
But.......
Today, I spotted a whole parking lot full of new S4's and 2010 S5's sedans and cabrios here in the bay area. The mirror caps on those were definitely plastic, but back to the flat silver/aluminum color, again like previous S* models and the RS4. Not shiny at all, and not "clear coat smooth" to the touch like the 08' or 09' S5's.
What's my point? I forgot, but finding a paint code so far has been impossible. Also, it seems now that the S5's mirror finish is exclusive and did not transfer over to any other S model car. (at least from the 2 dozen examples I saw today)
I wasn't sweated for walking around and groveling over the cars (about a dozen V10 R8's were there also), but I was kindly asked not to take any photos. I respectfully obliged. (for the most part)
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