Operator system with window crank

A home owner from Dartmouth, MA says:
Good morning,

I need to replace the above parts. My daughter is the homeowner and would like your assistance in choosing the correct part with the correct handle. Window was installed in 2006. The part number as I see it reads OP052020.

Thanking in advance of your time and assistance.

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Bob from SWISCO responded:

Hi Sheila. Take a look at our 39-325 and 39-326 ROTO Operators. These look similar; but look over the dimensions and see if they match what you have before proceeding. 

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