FYI something I used for a seat on my 31, Nobody can Identify, great to sit on, looks cool, and easy to find. Don't laugh. Find a 1984-89 Volvo 4 door with a REAR leather seat, Looks very plain, has an outer curve on the base to clear the door.
The secret is take a hack saw and cut out the center arm rest and it's corresponding base. Then re weld the seat springs together on the base. the backs don;t need to be attached to each other because both back and base fit tight in a stock Model A seat frame! They are pretty easy to find. Cool, cheap easy, and nobody knows where you got the cool seat!
Good luck, you got a cool roadster there. I wish I had bought it!
Regards,
Tony