You have a cool U-13 with a ton of heritage! Thanks for posting up a picture! We are always anxious to see pictures!!;D
The mirror heads do look like the chrome aftermarket variety instead of the later '67 mirror.
As for the original question on your thread, I still like the stock rims (15" or 16") with a stock tire size... like a 7:00-15 or 7:50 -15, or even the original 16" wheels. The 16" rims on Broncos never than an available hubcap from Ford, but they still look great in Wimbledon White!
But for what will fit, any 5 on 5 1/2" wheel with the larger center bore should fit. On your Bronco though, I would not go over a 30 x 9.50 tire because the the uncut fenders and the very limited output of the 170. The 6 cylinder does ok with a stock size tire, but it starts rebelling if you increase the size by very much.
On your U13 with the modified paint scheme and if you weren't painting it back to original, I would opt for a vintage (30-40 yr old) custom wheel like a slot, a vector, a turbine, or probably my pick, a chrome reverse and just a stock tire size.
The peacock blue halfcab has original 16" wheels, but they are not Wimbleton white yet...