big_dan_1950: Your images are too small to make a definite identification, but they do appear to be the wide running board option (with holes drilled for step plates?). The "hump" for the rear spring mount is not visible or appears to be missing altogether. Two possibilities I can think of; the running boards have been cut short where they attach to the rear fender, or maybe something changed with the introduction of tubular shocks in 1950?
Don/RdsLessTaken
Wide running board 1947:
http://i1291.photobucket.com/albums/b542/RdLessTaken/IMG_76612_zpsf5a7eb24.jpgTruck Album:
http://s1291.beta.photobucket.com/user/RdLessTaken/library/RdLessTaken%20Trucks
