What color is your car? IMO the center should/could initiate the visual voyage from the center cup via the silver rim over the black tire to the car body itself...
Choose a color that gives "visual answers" instead of something that creates "visual questions" (why did he choose that color?)
Pls post a pic of the finished result on your A2!
Silver rings and bezel/ring go well with a dark/black center - "connecting" with the black tire out to the car body.
Here is a pic of pepperpots and a silver S-line with black trim (sorry not properly cleaned).