Need help with replacement

A home owner from Kansas says:
December 26, 2020
Please see the attached pictures. This most closely matches part number 39-315 but with a shorter link arm. Is there a direct replacement available with a shorter link arm? The number stamped on the link arm is 20810.
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Bob from SWISCO responded:
December 28, 2020

Take a look at our 39-172, or maybe our 39-318. See if one of these is a better match. Compare the dimensions and let me know what you find. 
A home owner from Kansas says:
December 28, 2020
The first is close but the link arm length is not consistent with what I have, making the overall length too long. The second is too short. Any other options?
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Bob from SWISCO responded:
December 29, 2020

Unfortunately there isn't a closer match. Assuming the closest match is our 39-172, you have a few options. First, you could try installing the operator as-is and seeing if it works anyway. If not, you could then try to reposition the stud bracket along the window sill to make up the difference. Let me know if you have further inquiries. 
Truth Dyad Operator
Truth Dyad Operator
39-315
$24.40
Truth Dyad Operator
Truth Dyad Operator
39-316
$24.40
Truth Split-Arm Operator
Truth Split-Arm Operator
39-318
$35.70
Truth Split-Arm Operator
Truth Split-Arm Operator
39-317
$35.70
Truth Hardware Dyad Operator
Truth Hardware Dyad Operator
39-172
$32.55
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