Hi Jim, good score (finally right?!)
You either have 13" by 5.5" or 6" width coming your way.
I've never fitted anything to a tii, but these widths are larger than the stock steel wheel size, so you should be OK.
There are some small differences in the lips early and late, once you get them in I'd be happy to help you with photo identification. Also on the rear hub surface below all the rust there should be a date stamp, grind away with a copper wheel and see what you find.
And lastly, I would recommend 185-70-13 tires in whatever flavor you can find. Sumitomo makes one, but I'd skip the Kumho powerstar, I don't like the look as well, but they are affordable.
For anyone still reading--I'm looking for single 13" x 5.5" width Cosmic to complete a set for restoration, if you have a partial set in the barn, please contact me. mobiletradition | gm a i l
-Ben