Geo Henne window crank

A quick learner from USA says:
Per the attached photos, I have a Geo Henne straight arm window crank that has gotten stripped. It is 9" from the center of the gear hole to the end of the arm. It was probably installed in the 50's or early 60s. I am looking for a replacement. I need both a right handed and left handed one. Can you help me source this?
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Dave Sr. from SWISCO responded:


It appears you have a pretty old crank. I would take a look at the 39-020/ 39-021 along with the 39-520 track to see if this could be used as a replacement on your window. They appear to be the closest matches to yours.

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