Oliver 60 Row crop Bolts and Nuts - were they square?

As I sort out all the neglected items on my recently bought 1945 Oliver 60 row crop tractor, it's apparent that every nut and bolt holding the fenders, drawbar and other big items has a square head.
Looked at internet pictures and don't see evidence of this. This tractor is remarkably original.... and I'd prefer to keep it that way.
Are these 1/2" and 5/8" NC square bolts and nuts original? Possibly a war-time production need?
Thanks.
Mike
 

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