We're there shims under your radiator mounting pads? These were used to help in the alignment of front sheet metal.
I have never found a radiator support shim on any '54-55 1st trucks I've parted out.
Bruce See step 7 in "alignment" Your sheet metal alignment must have been good without use of shims? I have found at least one shim on all A-D trucks I have taken apart (they are mentioned in earlier A-D Shop Manuals, too).