Maybe this is intentional or just coincidence, but when I bought my black matte TST wheels (see above) I also spent $50(?) on a set of "black" plastic lug nut caps. Well, as I was swapping wheels last week, I happened to compare my Tesla "grey" caps to the Sportline "black" caps, and I was unable to detect any difference in color.. Side by side in bright light, I could not tell them apart. So for anyone buying he black TST wheels an have grey Tesla caps, no need to spend more money on the black caps, if they are different in color, I am unable to detect it.