The term is Lug-Centered which Dodge was, and Ford was through 1983. The wheels were also what they call "Coined." Coined wheels have alternate upset and recessed lug holes. The recesses on one wheel must mesh with the upsets on the other. Rear duals, that is. You'll see a slot in each wheel, and a pin sticking out of the rear hub to force you to align them correctly.
The wheels you have an need are Hub-Centered, or Hub-Piloted. There's a precision fit between the hole in the middle of the wheel and a seating surface on the hub. Look at one of those setups and the holes will be sloppy on the studs.
Do you understand OFFSET? Offset is the depth of the "dish" of the wheels. There are Dual Spacing Charts that illustrate Offset and specify how much offset is required for a given tire size. The duals can not rub sidewalls or "kiss" even momentarily with a dip or hump in the rod. The wheels you get should have the offset required by the tires you want to mount. I mention it now because it's possible the junkyard wheels you get could have been wrong for the tires mounted on them. You don't want to repeat that mistake.
Oh, I looked at an old Dodge-based Winnie and its 16.5 tires were only 8.00s.
