Wheel and tire suggestions for an early '80s D150

17" stock steelies for the LX platform litter the junkyard, or you can buy them brand new off amazon for under $100 each.

and you'll have basically your pick on tires in that diameter which is a bonus.

take note on the center register of any rim, it may not be big enough to clear the hub of the front brakes, or the rear axle. so best to measure those before you get your heart set on a set of rims that won't fit.