Does anyone know the correct length of the front and rear seat belts (lap belts) for a 1970 Challenger Convertible? Obviously, there are no shoulder harnesses. Don't need to know the length of the retractor belts as I have originals that are untouched, but if this info can also be provided, I would greatly appreciate it. I need to have my belts remade with the correct 4 rib design and material thickness. Can anyone recommend someone for this ? Thanx.