Tire/Original Rim?

[Tod59]

Hey Guys,

Tire size and original rim questions:

Question #1: Do these look like original '59 rims to you? I have the original hub caps too, but just wondering if this is the rim that would have come on the truck originally in 1959?

If they do look original, what size were original rims in 1959? 15x?

Question #2: Depending on rim size, will a 275x60x15 tire fit on the rear of the fleetside (tucked under the fenders with an original rear end still in truck) on the rims in the picture below? I also have a set of 225's for the front in a barn ready to install based upon your opinions.

Thanks
Tod