Mike the 4 rims that you measured at 3-7/8" wide inside will most likely be the 1941-47 standard 1/2 ton truck wheels as mentioned above. The 4" width measurements weren't that exact as you can confirm from the different measurement ranges you previously reported.
I have a spare set of 16" 6 lug wheels for my '51 3100 that also have the 6.50 X 16 tires (old bias plies) still mounted except for one wheel without a tire. That one measures roughly 4-1/2" wide (at the center of the tire bead surfaces) so yours mounted on your truck are most likely the standard 16" X 4-1/2" rims which would be original for your '53.
You mentioned the wheels mounted on your truck appear to have had the "clips added to them". It could be the original clips where damaged/replaced or simple removed and remounted (perhaps for painting?) as they are available form some vendors.
Without some further digging, I can't say what the 2 wider (4-7/8") wheels may be from. Maybe another Bolter has some info on that???
Dan
