A person from France, Alain, has contacted me, in hopes of ID-ing the wheels on his 1954 3104 pickup truck.
He wants to make sure the wheel/spare will mount correctly on the bed-side-spare tire mount.
It is a 6.50/16" tire.
My guess is that it will be OK, but:
A few photos are attached.
His wheel has 6 slots - I think the original 1954 16" wheel has 4 slots.
Here is an illustration from the 1954 Specifications Manual.