Crank mechanism

A home owner from WI says:
I have a Pella lifestyle bow window with crank out windows on each side. The left side looking out is stripped and won't crank out. I cannot seem to find the part number for crank mechanism. Also unsure how left or right is figured out. Please let me know. Thanks!
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Bob from SWISCO responded:

Thanks for writing in. Start by looking at our 39-391 & 39-392 Pella Casement Window Cranks. Carefully compare with your old operator to see if these are the right match. These work with the 39-403 and 39-404 Pella Folding Crank and Lock Kits. 

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