Not my car, just screenshotted from some youtube video.
Part circled in red. Guy who owned the car before me cut out part of the floor and welded another piece in to get his racing seat in (that little hump in the floor on the driver's side is missing as well, but I don't think that does anything except for accommodating the cat?). Seems like my factory S14 seats won't fit into my S13 coupe without it. Where can I get one, or are there alternatives I can buy to get my S14 driver's seat in my car?