RH Window operator

A handy person from Wisconsin says:
July 18, 2017
The link arm has the number 0 and the number 78 stamped on it. No other obvious markings.
* Arm is 2 1/2" center to center of pivot holes.
* 5 1/4" between upper and lower mounting hole centers.
* 1 1/8" between lower mounting hole centers.
* Riveted E-clip stud is 3/8" in diameter.

I have not found an exact match but did find a similar unit with a threaded hole in the link arm rather than a rivet and e-clip mount.
Thank you,
Robert
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Dave Sr. from SWISCO responded:
July 21, 2017
I believe you have an older Silverline operator with an E-ring stud. What I would use as a replacement is our 39-025 operator. The dimensions are close to what you have, plus you won't have to deal with that E-ring clip. See what you think.
Awning Window Crank Operator
Awning Window Crank Operator
39-025
$27.10
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