crank for metal casement window

A handy person from Florida says:
Need to replace this crank for a metal casement window. What do I need to measure to find the correct part.
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Lauren from SWISCO responded:

Hello, thank you for posting! 

Your operator resembles our 39-001 or 39-002. Please review the dimensions on the product page that show how to measure your existing operator for a good fit. Please let me know if you have any questions. 

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