Good luck. I have seen some pics of early dually panels, but not sure if they were factory built, or built by a body supplier, (which was common practice.) I know 1940 standard fenders are only available in 'glass, so doubt you will find new steel fenders at all. If you do, find a expert TIG welder to fab a set for you.

And, welcome to the forum, and please don't use BOLD type!

1940 Chevy 1/2 ton pickup "KC"
A day without sunshine is like, well, ..... dark!