Joe, don't forget the '38 cab. They look just like the '37 only they have a hole in the right rear corner for the fuel filler neck. 38's are different from the firewall forward, hood and grill, but the fenders are the same as long as you stay in the same ton rating.
Mainjet, don't buy car parts for your truck. The '37 cars look about the same but will not interchange.
Joe