The piece that hits in here to connect to my window

A quick learner says:
I need the piece that slides in here that connects to. The Window
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Bob from SWISCO responded:

The detach clip looks like our 39-105. I'm less certain about that bracket. Show me the entire operator, including the body and link arm(s), and I should be able to narrow it down. 

Connecting a casement window operator to stud bracket
Connecting a casement window operator to stud bracket
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