Which replacement part? (window operator)

A landlord from California says:
I'm going to order 25 operators and want to get it right? How difficult is it to install a new channel guide?
User submitted photos of a window operator.
Profile picture of Tom
Tom from SWISCO responded:
We may be able to help, but I'm not sure what to recommend. Your operator is very old and likely not made anymore. Our 39-044 and 39-045 look similar, but I'm not sure if they can work. We have other similar parts that may work, which you can see here.
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Anatomy of a casement window
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