A 15x7 steel wheel is the ticket for 275-60-15. You need that 4 1/4" backspace to get these tires on. (MT ET Street Radials)

Also what I did to make sure it didn't rub on the outside sidewall was to use a small bottle jack and a 2x4 to flatten that hump up in the wheel well where it protrudes toward the tire. Go slow and feel the quarter panel on the outside as you go to make sure you don't distort the outer panel. I gained almost an inch of clearance, tire never rubs there now.