Lemco window operator

A quick learner from Jackson, MS says:
Looking to replace two of these Lemco operators. Any idea what would be an appropriate replacement ? I haven't been able to find anything online.

Thanks
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Tom from SWISCO responded:

I'm afraid I don't recognize this operator, either. I may be able to track it down but I'll need more information to get started. To start, can you remove an undamaged version of this operator from the window in its entirety and show me a few more pictures? I need to see one picture that shows the installation hole pattern (top and bottom in the same shot) and another picture that shows the link arm that connects to the window hinge. 

A quick learner from Jackson, MS says:
Here are some pics
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A quick learner from Jackson, MS says:
Additional pic
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Tom from SWISCO responded:

Thank you. Unfortunately, we don't have an operator that matches your design exactly. The closest we have is perhaps our 39-256B and 39-257B. Look these over and see if you could use them to replace your original.

A quick learner from Jackson, MS says:
Thanks. I'll try these if I don't end up replacing the windows.
39-256B : LH Look-Rusco Window Crank
LH Look-Rusco Window Crank
39-256B
$19.83
VIEW >
39-257B : RH Look-Rusco Window Crank
RH Look-Rusco Window Crank
39-257B
$19.83
VIEW >
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