Tom from SWISCO responded:
June 6, 2022
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I look at your recommendation of the 39-035 and it does not have the two arm connected to the worm gear assembly. (One of the arms is a two part articulated arm.) The 39-031 seems to match the mechanical structure. In my window a long single rod connected the gear assembly is 9 inches pin center to pin center. The articulated arm has a S shape rod connected to the gear assembly with 3.25 inches pin center to pin center. The articulated rod connected to the S rod is a straight 4 inches pin center to pin center. Please note that measurements are pin center to pin center and not rod length. I have also included 2 pictures for clarification of the above text.
Sincerely Rob