Be specific when ordering as Saloon and Convertable are different also year of convertable.
I drive a 68 MK1 Vitesse con. belt mounting points on rear wheel arch,slot in rear quarter panel, and through transmission tunnel to tappings on chassis. Earlier MK1, long term project, I have mountings at front top corner of hood well and central fixing to top of tunnel, not to chassis and not sure I would trust them. The seatbelts in the car I drive are long enough as I have the seat right back so check length carefully, the belts are inertia reel but needed careful fitting to fit behind quarter panel and avoid hood frame.
Seat belts are for you and your families safety so fit carefully and do not forget the rear seat passengers. Had a picture of my Vitesse, on old forum, after some idiot turned right while coming towards me.
Regards
Paul