I'm 6' 5" too, and while I haven't had a huge amount of experience in different seats and cars, I found stock sprinter seats in a sprinter were remarkable good for everyday comfort (not so for support on the track though) and my head cleared the roof, even in a helmet.
Also a steering wheel spacer is a great investment. It's really nice to be able to fit your knees behind the steering wheel.
Hen
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