The Lotus Brand (or is it Brand Lotus?) wheels are the "correct" alloy wheels for the TC and TCS. I've always thought they are among the best looking alloy wheels ever. My memory from when my car was new was that they were painted a gray with a hint of green. They were NOT black. Unless you have an old unmolested wheel, I don't know how you'd recreate the exact color so if you wanted to get as close as you can, a gun metal gray would be a very reasonable choice. I've attached a picture that is either the original color or close to it from my memory. It's common for people to paint them black (probably to avoid the hassle of trying to get the right shade of gray, a mistaken opinion that they were originally black, or for better contrast with the aluminum) and I think I've seen other colors too. If you want to paint them a different color, you won't get any complaints from me.