I agree with John. Either grind a bit off those castings or try a 1/2" spacer between your wheel and the hub. Tire stores that sell custom wheels should have them. I used them for over a decade on my Mustang. If they aren't for you, I'm sure they will take them back. So, call around.
It's awfully odd that your Ranger wheels don't fit because they were made for disk brakes. - Dave