Dave Sr. from SWISCO responded:
November 22, 2016
Thanks for posting! After measuring a part from stock, I can say that our picture that displays its dimensions is accurate. I agree that the 39-258 is the closest operator to yours. The 1/8" difference in the link arm can be made up with the travel in the gearing. As for the 1/16" installation hole difference, I'm not sure if that could be a problem. Make sure you're measuring from the center of each hole, not their edges. If it is an issue, you could always use a rat tail file to adjust the hole.
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