operators for unknown vinyl replacement windows

A quick learner from Branford, CT, USA says:
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:

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:
Yes, the 39-317 is exactly right. Thanks for the help!
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Tom from SWISCO responded:

You're quite welcome. Be sure and get back in touch with us and let us know how everything works out. 

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