Located in East Peoria, Illinois
16" Kirkey High Back Kart seat with cover - as used in my Austin Mini. Will fit cars that require a narrow seat (like Miatas). No side mounts or rails included - but they can be had through ioportracing.com fairly inexpensively. For reference, I'm 5'11" and about 220 and I fit in the seat (though it's a little snug). Seat has been drilled for side mounts previously and the back brace also advertised below.
$180.00 OBO Local Pickup Preferred
The black one in these pics... in case there's any question. I just set it in the Lotus to see if it would fit. It does... but there's no way I can get in and out of it with the top on. :D
Also - used but nice ioport racing seat back brace as used on the above seat (bolts to the harness bar and the back of the seat to keep the seat upright in case of on-track accident. Required by some sanctioning groups:
This model (I'm working on pics of the actual part I have): IOPort Seat Back Brace
$50.00 OBO plus shipping