BGTV8

As a follow-on to my earlier post, I have had another look at the URL reference posted by Mike (specifically the Rennline Driver Side Harness Mount - I don;t thonk any of the others are applicable), and the mounting hardware may just work. The key will be for the chosen components to be mounted such that any load is a straight pull - that implies that the components need to point towards the front of the car, not the rear.

If there is space for them to be mounted in such a manner, with the seat positioned normally, then it will all work, but if not (i.e. clearance dictates that the only way these can be fitted is if the tongue that the harness clips into is pointing to the rear of the car), then I can't see how you can avoid the potential for the belts to become loose as the fixture is moved by the very large loads that exist during a big accident.