I believe the original rims are 16" x 4.5"
Correct. Later 16" rims (55.2 and up) were 5" wide. They usually had only 3 hub cap clips instead of 6. The 5" wide wheels were used with 6.50-16 tires. If 6.00-16 tires came on the truck, it would still have had 4.5" wide rims. The 4.5" wide rims were phased out (along with 6.00-16 tires) for '56 model trucks. Later Vehicle Info Kits dropped wheel size data for some reason. But they do not include 6.00-16 tires on any models.
