We ran our Miata at WGI last week with the factory seats and 3-points. Lotta fun, painful back from trying to keep me in the seat. I learned that already with the TR....
Any input on how a Corbeau A4 would fit? I'm long legs and tall, and the adjustable back helps a lot - I got stuck in Wasilko's passenger seat....

Also, someone at WGI was pretty hyped about Konig RacingBuzz seats. These are fixed, FIA listed, but seem to require a lot of drilling to mount in the Miata.
Thanks!