I have worked on a lot of late 1947-49 trucks and have never seen them on those year trucks.
Anyone else have them on these years?
Next time I'm at the farm where a bunch of my parts are located, I'll take some pics. This is a '49 GMC 1/2 ton frame.
If I can't find the pans, I should be able to take some pics of the rivet holes in the frame where they once resided.