What size rims do I use?

[NDApache58]

Good Morning. I was given a set of rims for my 1958 Apache 3600. After the tires were taken off, we noticed that two rims were wider than the others. They are 8 lug rims, but I can't find anywhere that will tell me which two are correct so I can find 2 more. I have the original shop manual, but all it tells me is tire size, not rim size. I'm a novice at this, so if anyone can help with which rims are correct, I'd greatly appreciate it. Thanks! Mark