#7 end piece: which watch is it for?

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I’ve been researching Omega’s vintage flat link bracelets and was wondering about the #7 end pieces. They are 18mm wide and fit the Ranchero/Seamaster 2990 and 2996 cases well on the front side, but have a wider radius and therefore somewhat misfit on the backside leading me to question: which case/reference/model was the #7 end links originally intended for? Speedmaster Reduced perhaps?
 
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Ah yes…thanks for reminding me…I’ve seen that post before….unfortunately, the “007” end links does not seem to be on the list, unless I’m missing it.
 
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Ah yes…thanks for reminding me…I’ve seen that post before….unfortunately, the “007” end links does not seem to be on the list, unless I’m missing it.
I also did a quick search and didn't find them. On the third page of the thread @Dan S made a searchable list.