operators for unknown vinyl replacement windows

A quick learner from Branford, CT, USA says:
November 11, 2019
I need to replace the operator for all the casement windows on my house. Your 39-171 looks almost right, except that the final straight arm is about an inch longer than mine, and it looks to have a jog that mine does not have. On mine, the measurement from center-to-center of the hole with the clip to the pivot pin joining the two arms is approximately 3.5". One of the photos shows some patent numbers, if that helps.
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Tom from SWISCO responded:
November 15, 2019

Hi there! I don't think our 39-171 is what you want. This operator has offset link arms, while yours is straight.

Consider instead our 39-317 and 39-318. These look closer to me, and also match the dimensions you supplied, to boot. Let me know what you think.
A quick learner from Branford, CT, USA says:
November 15, 2019
Yes, the 39-317 is exactly right. Thanks for the help!
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Tom from SWISCO responded:
November 15, 2019

You're quite welcome. Be sure and get back in touch with us and let us know how everything works out. 
Truth Hardware Dyad Operator
Truth Hardware Dyad Operator
39-171
$32.55
Truth Hardware Dyad Operator
Truth Hardware Dyad Operator
39-172
$32.55
Rivet
Rivet
62-014
$1.12
Truth Split-Arm Operator
Truth Split-Arm Operator
39-318
$35.70
Truth Split-Arm Operator
Truth Split-Arm Operator
39-317
$35.70
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