operators for Hurd windows

A home owner from Palo Alto, CA says:
I wanted to replace these cranks with folding cranks. Will your parts 39-376 and/or 39-375 work for these crank arms? And how would I determine whether I need a left-handed or right-handed crank?
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Emily from SWISCO responded:

Hi there!

Our 39-376 and 39-375 won't work for your operator. These items are designed for operators whose spline sits on the side of the housing, while your spline is dead center. Take a look at our 39-107FK instead and see what you think. The 39-107FK is neutral, which means it will work on left handed and right handed operators as long as they are Truth EntryGard series operators. 

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