I think gunmetal is gonna be the best option dude!

Given that they are "only" 17"s, the gunmetal will blend with the tyre pretty well and hopefully wont look as small...

Plus, the 5 spoke 18"s you had, and then I had on the wagon were "the bomb"!! and they were shadow-chrome/greyish

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'04 E46 S/C M3 Coupe