I made a set of rear seat belts out of some leftover webbing with orange tracer, VW plastic caps and correct thickness end plates as the original US market rear seat belts. Don't get me wrong, RePa/Porsche never sold rear seat belts with this type of webbing for the early 911 (69-73), but it will look nice with the original ROW front seat belts. Asking €150,- plus postage.
Cees