I believe these are caradco window from 1975

A handy person from Roundup montana says:
The left and right operators need replaced. The operators measure 15 7/8 inch from one end to other end of crank. Or 12 inches to the first bend in the arm
User submitted photos of a window operator.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting. Check out our 39-013 and 39-014 and see if either of these can work.
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