I tried several different options to achieve a match to the wheel trim. Anthracite gray is the one I chose. I used plasti-coat because I wasn't sure they would look better than the silver on 87s and I had seen flat black wheels that were clean and looked dirty. The gray has some metallic in it but to be sure the wheels didn't look dirty I added several coats of clear gloss. That was almost 3 years ago and they still look like they were just done.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas