big_dan_1950: This sure looks like another set of the elusive 1947-1949 wide running boards (option #389) minus the raised "hump" for the leaf spring hanger. Interesting how your inside tread ridge ends a few inches short, exactly at the spot the "hump" exists on the other examples we have seen.
http://s1291.beta.photobucket.com/user/RdLessTaken/library/Wide%20Running%20Boards
