Looking at my 1940 chassis book it looks like what often is called "standard" bumper irons fit the 01C or commercial.
01A-17754-A arm outer right (1)
01A-17755-A arm outer left (1)
01A-17766-A arm inner (2) (indicates same part used on both sides)
These are different then the deluxe parts which have -B part numbers.
You should be able to find these, just make sure you get the "std" ones. The Deluxe arms would have your bumper out farther from the grille.