[442w30]

I think you're mistaken on the black 'Cudas.

Off the top of my head, there's two red ones, a Vitamin C one, a dark green one, a white one, perhaps two black ones, two purple ones . . . hmm . . . used to know this like the back of my hand - senility or changing interests?

Otherwise, what's interesting is that purple was THE popular color for the Challenger R/T, while black was not so much for the 'Cuda.