I was just reading Corvette magazine and I saw an article on a company that does all new leather and foam for 1990 (and whatever other years have that style) seats. Looks just like the original but you can get whatever color combination and stitching you want. It's at my father's, I'll stop by on my home tomorrow and dig it up if you want.
I need to re-do the bladders on mine, just never got around to it.