SWISCO - The Replacement Hardware Authority

I need your help selecting the right replacement operator for my window.

A quick learner from Casper WY says:
long arm is 40753
short arm is 31538
other short arm is 20810
main body is 45179
User submitted photos of a window operator.
Profile picture of Tom
Tom from SWISCO responded:
Please see our 39-031, this looks to be a great match. I would just confirm that all our dimensions match up.
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