What is this part?

[Easynow]

Apologies, I colloquially use EX since that's what I gather the equivalent U.S. model that came a little later was known as. This is the European SAE model, (deluxe?).. six gears square tank spokes abs etc.

Anyway, I do not believe AI on that one either!

Only thing I see that could be similar is this pair of blind mounting holes for the rear brake reservoir?:


Edit: turns out no, these are seperate captive nuts.
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