Doug
In getting our interior together, we really needed seat belts. We had zero. I ordered some from an afermarket catalog. They came in and they were no where close to what we wanted. Thankfully, Brian Beatty came to our rescue (as he has done so many times in the past) and brought a set of pretty good blue seat belts that needed cleaned. I stuck each strap in a bucket of soap and water and cleaned them and then laid out to dry. BB also had some seat belt cases and other parts. We pieced things together and I believe I bought some aftermarket cases from one of the catalogs that fit and worked great.
I hope this helps.
Paul