1965 Valiant 200 Wheel Sizes & Lug Pattern

I've never run any, but did slip a set of 5x100mm on just to see how they looked. They did fit..

Honestly, if you care going to spend a nickel on aftermarket wheels, swap to 4.5" and be done with it. You'll be glad you did. You can get any wheels you want with any backspace you can dream of.