Moving 3.2 Carrera inboard seat belt receptacles from seat to tunnel or floor
This should help you out. I just got done doing this mod. Sorry no pics but it looks just like the one out of square tubing bolted through tunnel with a big hardened washer. It takes a little time to do and both my seats were out. Disconnected shift coupler as well so shift rod could be moved out of the way a bit.
Joe