Looking for rare welt tips

[1930.68B]

We are in the final stages of restoring a 1930 Cabriolet. The upholstery shop pointed out that we are short the special welt or binding tips that are used at the triple hinge. The attached photo shows the right and left tips that were used for this application. I haven't been able to locate these tips in any of the parts catalogs. I have reached out to MAFCA and the Cabriolet Club. If you have any leads for me to look into, it would be greatly appreciated.