Tom from SWISCO responded:
October 1, 2019
I appreciate your patience in this matter. Sorry our response took so long, it's been a very busy season for us. Your operator bracket here has me a little perplexed. I've never seen one quite this large. Even looking back through our records, we don't have anything quite in this size. That may be why your dad didn't use the original hardware, he may not have been able to find it. I think a good place to start is with our 39-545 and its opposite-hand partner, the 39-546. These have a triangular shape that yours lacks, but this also means that they stick out just a little further than other brackets. At its widest point, it comes out to 1-3/8". Can you confirm this same measurement on your bracket? If it's the same, then you very well may be able to use this as a substitute. Note that it's designed to work with operators like the 39-316, or 39-221, in addition to other, similarly designed parts. Let me know what you think! Dimensions for 39-546
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