It arrived. It seems like a Coppa fairing. There are decal artifacts that indicate it had another decal looping under the red one..... Also, the silver paint looks original, the same shade as my '00 Sport.
The part number MG 01.57.75.80 doesn't turn up anything, but since OEM parts generally start with "GU", it may be a Stucchi. It is ABS or some kind of thick plastic, not fiberglass.
In any case, the headlight opening looks a little small for my Sport and its chrome headlight bezel, but I have to do a proper test fit.
I am busy sorting my nearly-new Stelvio, so I'll get to it later......