SWISCO - The Replacement Hardware Authority

Please help me replace this gear box

A handy person says:
need roto-gear box only
User submitted a photo of a window operator.
Profile picture of Tom
Tom from SWISCO responded:
Thank you for posting. This looks appears pretty similar to our 39-172. Take a look and let me know if you agree. You may also be interested in its opposite hand, the 39-171.
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