window casement operator split arm

A home owner from Newton,MA says:
I am looking for replace the window operator. can you help me identify it?
This picture is of left hand but I am looking for the same with right hand.
User submitted a photo of a window operator.
Profile picture of Tom
Tom from SWISCO responded:
Please see our 39-175 and 39-176. These appear to match your operator, but let me know what you think.
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