Casement window opener replacement

A quick learner from Washington DC says:
Hi Swisco,
I am in need of two replacement casement window openers (one right hand and one left hand) for my casement windows. Can you please help me identify what the correct replacement would be for this part. The box is 5 1/4 x 1 1/2 inches. And the arm is 9 1/4 inches long.
Thank you,
Charlotte
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Emily from SWISCO responded:

Hi, Charlotte.

Thank you for your patience during our busy season. Take a look at our 39-001 and 39-002 operators and see if our dimensions match up to your original assembly. 

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