It is amazing what you can find with different approaches to things. I was not looking for rubber mats; I Googled "classic car windscreen seals" and lookie what came back:

http://www.automobiletrim.com/rubber-flooring.html

It would be a bit expensive, it has to come across the big water. But, I might be interested in sharing the expense for enough to do a car, front, back, and trunk, if you care to persue the matter. One or two more people in on the "buy" might make the difference between affordable and not.

Meanwhile, I will see what I can find in North America. ;-)

sd