Dave Sr. from SWISCO responded:
July 14, 2015
Take a look at our 39-031 and 39-032 operators. Looking at your photo, these appear to be a good match. However,, you will need to reinstall the attachment clip at the end of the link arm, since it appears you either don't have one or that it's in a different position. Fortunately, these can just pop off with a screwdriver so that's not a big issue.
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