Looking for replacement operator/encasement

A quick learner from San Diego says:
Hello, have a part that has rusted/broken on the operator arm of my bathroom window. I do not know the window make, do not have a part number. Inserts through a 5in insertion site at the base of the screen. Was hoping on your insight towards finding the exact part or a proper placement. This website has been super helpful and was hoping for some guidance. Thank you in advance.

Scott
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Jasmine from SWISCO responded:

Hi Scott,

Thanks for writing in! Your casement window operator looks similar in style to our 39-221B Encore Dyad Sill Mount Operator; the opposite handed version is part 39-220B. As you may notice, these operators are slightly different in design. 

That said, to confirm that these are the right fit for your window, carefully review and compare the dimensions below. If any of the dimensions are not a match please let me know your written dimensions.

detail of 39-221B
detail of 39-221B

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