You need find a 4 x 4" pattern. Chevy Vega, some of the later ChevyIIs and a few others I can't recall. Some 100mm wheels will work also. They do make wheels that have an oval stud hole that will fit
Listers, I think that Sprite wheels would probably be the cheapest and easiest to fit. Oh, you could go up to 14" by using a Morris Minor wheel but they are only 3 1/2" wide and can't take much of a