Call Terry Goetz @ ISS Seating. He has exactly what you are looking for and he is a nice guy to boot. I have his seats in my 34 Sedan. I bought them from CARS Upholstery originally only to find out Terry supplies them to just about all the upholstery shops in the US.

Here is his website...

Best of luck and let me know if you have any other Model 40 questions.

Troy

http://www.issseating.com