Hi Bart,
I'm in the same situation except I'm fitting seat frames for a 1936 Chevy 2 dr Standard.
I was hoping to salvage the rear seat frame but when removing it the wood just started breaking apart.

In checking out seats there are some out there for our hobby. I suspect you will be more lucky than I in finding seats as there is a lot more available for the Ford than the chevy.

I do have a 34 ford deluxe 4dr and that has seats from Tea's Design in Rochester MN.

Here is a list of some of the places that I've checked out.

Tea's Design http://www.teasdesign.com/
Glide Engineering http://www.glideengineering.com/
Krist Kustoms http://www.kristkustoms.com/
Street Rod Seating http://www.rodseat.com/
Cerullo (I'm impressed with these seats for some reason) http://www.cerullo.com/

Then there is always e-bay if you know the dimensions of the seats you are interested in. Some seats may work or need modification to work, but then you can also get an integrated seat belt system, power, and if needed heated seats.

I'm doing the shopping around right now myself and have not picked a route but I'm investigating Cerullo closely. Nothing wrong with the Tea's that are in my 34 as they are over 10 years old now, but thinking that I want to investigate what is out there.

Jerome