66 Valiant ~ Wheel size / offset question

The wheels on my new Valiant (at least the drivers side two) are heavily corroded from being in the mud. So sooner than I would typically like I need to look at wheels. I have done some research into changing the bolt pattern, but I don't think I am going that route currently. So I have been looking at SBP 5x4 (guess thats 5x101.6) 15" wheels since I need two anyway. Pretty limited options it seems.

My question is, I don't know what offset I should be looking at to fit correctly. Is there a chart or anything I need to look at?

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