I've got a miata body all ready to go for mine. And yeah, it uses the 16/18/20 pinion combo.

If I really tried, I could bring it out for practice tonight, but I think I'm just gonna wait til tomorrow, since I havent set the ride height or wheel alignment yet. For anyone wondering, the kit comes with +2 degree toe rear hubs. I was going to use the 1.5deg aluminum hubs from my m04, until I noticed that.