Does anyone please have the official paint codes for 20" Rotor Wheels, as supplied (I believe) mainly on Black Edition models? Or even better a source for the paints?

The wheels are the two tone matt finish and I have managed to source the darker grey colour which is used on the main part of the wheels but am having trouble matching the lighter matt aluminium on the outside of the rims. I have slightly kerbed one of mine (horribly easy to do with the 20" as others will know!) and as I own a small compressor and airbrush I will fix it myself...but the aluminium seems a particularly tricky one to match. Have tried a couple of aluminium wheel paints that I had lurking in the garage (Wurth and Simoniz) but they are considerably brighter than the Audi standard.

I've hunted around t'internet but so far without any joy. Can someone help please?

Many thanks
John