The thin fiberglass seat that was fitted to the car was mounted in with a self taping screw so something more substantial is called for from a safety point of view, a used alloy seat from a speedway car will fit the bill with a few modifications and will be able to be mounted mounted to the floor/frame with some race car mounting brackets. the wings at chest height will need to be trimmed back a bit and the headrest will need to be lowered and the padded cover is a little tatty so it will need a tidy up and some more padding but it fits in the rather narrow cockpit [42CM] and my butt just fits into the seat with my race suit on.