Custom wheel adapters, check these guys out

190 for 2, thats not a bad price considering they are custom made to your measurements, universal ones will prob cost at least 100 for a pair if not more, and made from a cheaper material

Only needed 2 the rear is a 68 sbp and i converted the front to the lbp disc brake and run the 15x7 rally wheels all the way around, plus the adapters help me use a 275 tire on the back by bringing the tires away from the leaf springs, yet not too far out where they rub the lip on the wheel well