Here is a photo of my '66 ford 2000. I have 2 sets of the same weights laying in my barn that came off this tractor. Notice the three holes in the rim center disc. These are 28" rims. The other three holes are for doubling the weights up.
My '64 PA rims are 28" and they look like they might fit if you drilled the holes. Don't know weather they will fit your but if you need me to measure something just let me know.