ooooo..gonna make me think here....
maybe Warren will chime in if he is lurking, but I believe the lap belt points were used, and then a custom point was made on the firewall between the gastank and cockpit. Where you can see a little behind the firewall from the spare tire compartment, I believe there was a metal reinforcement plate added and the shoulder points were there....might be wrong though. I am investigating a new way of getting 4 points installed and not having much luck....