So we absolutely love this seat but upon test fitting into our 1991 Miata, have discovered/determined although it works perfect for me at 5'10", it won't work for my husband who is 6'2" unless we did extensive modifications to lower the mounting points for the seat (not something we want to do right now with all our other projects.)
So this seat is $799 directly from Sube sports in California here:
Sube Sports - The Racing Equipment Source
NOTE This is the standard seat (not the GT version which I highly doubt would fit in a Miata anyway) so I'd say up to 34" (possibly 35") is the widest waist size that can wedge themselves in... ideal for 32" waist IMHO and 'snug' but still good fit for 34" waist.
It was ONLY test fit (never actually used) so is brand new with proper FIA sticker of course with FIA hologram. With the newest published FIA regulations, this seat is valid until the end of 2017 without requirement of a seat back brace (can be used after 2017 with a seat back brace of course for wheel to wheel racing)
NOW selling for $700 cash pick up price in our home in Mt. Prospect, IL
I can be reached quickest via TEXT only (928) 693-7441
If someone is serious QUICKLY, my parents are about to drive down to Phoenix from here in Chicago this weekend so if someone there has cash ready, it could be made available in Sun City, AZ to pick up from my folks.