Dave Sr. from SWISCO responded:
July 18, 2017
The 39-026 operator was popular in the Philadelphia area. The bottom holes on the 39-026 are 1-3/16", which is only 1/16" off from yours. If it is a problem when you mount it to your window, you could drill the holes out to be a little larger in the casing. That should give you a little more wiggle room. As for the arm difference, I don't think any adaptation would be necessary. You should have enough travel to make up the difference in length.
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