Casement crank mecanism

A quick learner from Pittsburghpa15227 says:
January 25, 2021
Truth mechanism top arm30905 lower arm30744 both arms 5 inches need complete mechanism
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Tom from SWISCO responded:
January 26, 2021

My recommendation is the 39-171. This looks very similar to your part here, but see what you think.
Truth Hardware Dyad Operator
Truth Hardware Dyad Operator
39-171
$32.55
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