Thunder Ranch, if you're talking about the trailing fiberglass type that contour to the rear of the car. I think Russ Rodriguez might do them also. I got mine from TR, and then hacked them up and mounted them on some aluminum in place of a roof.
Or you could sell the seat blanks you have and get a pair of Porsche 914 seats. They already have the headrest built in AND drop right into a Speedster cockpit.
Dang, Gordon... That's what I came up with today. I'm designing my twin roll bars and trying to get measurements of seats that have them. The Miata seats are close.
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