Rally Wheel Questions-Noob

Are all rally rims at least 5.5 wide? I have never seen any narrower than that

How hard is it to find center caps and trim rings and more importantly, how expensive? Trim rings are the same as big bolt pattern rallye wheels, so they should not be impossible to find. The centers are tougher, though. Those are unique to the 4" bolt pattern. Wheel Vintiques has repros for $52 each.

Will I need to buy new lug nuts too, and are they readily available or expensive? You can use regular cone seat lugs. It's helpful to have longer lug nuts though because its easier to get a lug wrench on them.

Can I put the rims on for now without the center caps and use my old lug nuts? Yes

Has anyone ever painted rallys black or body color? I have seen that done. Sometimes it even looks good. Sometimes.