Well, it was 70-some pages in; but this looks to be approximately the only connector in the universe with the threads on the right side. Even has the ‘flattened’ style keying.
Worst case, they appear to only be sold in pairs; so I’m assured of having something that will interconnect. No idea why this variant was so rare. Let’s see what the supply chain gods feel like bestowing upon me.
Thanks for your suggestions.
