SuperCoupe 15x8" (cop style) rims, or 15x8" Ramcharger rims. Those are your options. You will find neither in a junkyard, unless you are literally the ONLY Mopar guy within 500 miles and have been asleep for 20 years.

I think you'd be better off just buying some new 15x8" steel rims from one ov the few vendors out there that make Mopar rims. I also think this would end up being cheaper than if you found some Ramcharger rims for sale somewhere. Last i checked they were NOT cheap rims to buy, and last i checked was a long time (and a lot ov crushed/recycled rims) ago...