All three of my US spec Series IIa's had 15" rims a 67, 68 and 72. It was really hard to find tires in 16" back in the 70's and the main replacement rims where the 16" NATO rims. So if you wasted a rim you where kind of SOL. A popular mod was to get a set of the white welded spoke wheels, oh so popular in the 70's on 4WD's. Back then my favorite tire was the Armstrong Norseman, killer tire.