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The Ford wires are only 16", 17" or 18". After a while you become accustomed to them and can judge by the "spindliness" of them and can tell the difference just by looking. The 16s have the shortest spokes and smallest gap between the central hub and the rim. They are easy to spot. The others are not so easy but it's the 16s you're looking for. The hubs are the same on all the models.
Here are some pics.
1935 16 Incher:
1933/34 17 Incher:
1932 18 Incher.