Bumping this as I am looking for the same info.
I just had my 100's wheels refinished as they were very sunfaded. I used a local shop who called this powdercoat finish "Hyper Black 3". They turned out really nice, but I think they are a little dark. They have a Hyper Black 1 through 5, with 1 being the lightest and 5 being darkest. I am considering having them re-done in "Hyper Black 2", a shade lighter, though I don't know if it's worth the hassle and I should just leave it.
From what I understand the original Toyota finish is very difficult to get right. If anyone has any info on a perfect OE match please share. If anyone wants to use the shop I used it's Crown Customs and Coatings in Wheeling, IL. You could always ship them your wheels. They did really good on the Hyper finish how it can look darker or lighter depending on lighting condition. Pics below, they are still working on the center caps.
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