Thank you Bill and Tim!!

Two last questions:

From other posts, I've gathered that tire companies won't mount radials on some of these old skinny wheels, that the modern width equivalent would be 175 or 185. Is this true? If I use these old 4", 4.5", or 5" wheels, am I stuck with modern non-radial tires?

...Which brings me to a last question: Two of the 4.5" wheels I bought came with nice condition black wall tubeless 6.50-16 tires on them ("Super Hi-Way, load range C). I'm tempted to complete the set of 4.5" rims and get a few more 6.50-16 tires. If I need to do this as inexpensively as possible, do I look for some tubed tires from STA or Miller, or perhaps a local tractor supply company? What's the best option?