Are you sure that even Sarco has them? The post war ones are common, but the WWII are not easy to find! The Legs are the same for BAR and A6, and they changed them at the same time after the war, what ever year that was.
Early legs have the wing nuts at the bottom, close to the "foot". That's the quickest way to ID. But, it isn't just the placement of the wing nuts. On an early leg, the top part is the "female" and the lower part is the "male". The wing nuts are different .... I think the thread is smaller dia. That's everything I know off the top of my head.
Not only is amish-bob right, the male and female were reversed on the later legs and the WWII lower wing bolts are smaller, but the only reason I even have a pair of WWII legs is because amish-bob went out of his way to find me a set at the Creek this spring. You are a class act, Sir! I recommend everybody do business with this fine gentleman.
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