vent window channel - u-shaped pieces that attaches to door glass

everybody that I contacted (including PartsMix) are out of these. I know about the issues with the currently available product (there only seems to be one manufacturer) but they are a whale of a lot better than the 50 year old disintegrating ones now in place. I'm hoping someone has a set around that they are willing to part with. Any other sources that I might not be aware of?