Originally Posted by 35mike
Coupes have a bench seat. 2 door sedans have folding seats for access to the rear seat. Any evidence of present or past cloth upholstery would indicate passenger car origins. Seats like these, with holes in the back, are on eBay regularly. Sometimes they have crazy opening bids or "buy it now" prices and rarely get a hit. If they were real panel truck seats, I think they would sell, given their rarity.
My '37 panel seats have smooth, solid backs. I will check to see if the passenger side has a folding backrest, but I don't believe it does. I think they have original covering.

Mike
Back in the 30's they had a 5 passenger coupe with tilt seats.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn