Older ones can have different numbers of hand holes, I believe I had some 5 hand hole ones once...
I'm still looking for used ones for you.

But so long as they roll does it matter? Can you distinguish the number of hand holes when driving down the road?

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-