I will be getting a set of 6 lug rally rims for my 61 Apache...they were added in with the sale, but I'm finally getting them in a week. The guy said they are wider than the original rims. So I need to find tires for them. They are apparently off a 1970s 4x4. Do any of you know the correct size of tires for these? My truck is riding on a worn set of 235/75R15's right now. They'll have to be wider than that...