[oldandtired]

Karl...I enlarged the image as much as I could, and I believe you have a good eye. The 40 and 41 headlight doors have a curved front edge instead of a fairly sharp front edge and those appear to be the later headlight doors made for the sealbeam. If they are sealbeam doors, I think they would be 40's not 41's. The 40 headlight door is wider than the 41, much like the 36 passenger is wider than the 35 passenger and 35-39p/u.