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This guy is a guru :-
https://bmwmotorcycletech.info/
There are a lot of variations in the models over the years. I had the fairing in a box for 5 years having tried unsuccessfully to get it fitting properly first time round.
It's worth looking for the old 90S screen with the metal fittings included.
The flatracer kit seems to have everything you need :-
https://www.flatracer.com/flatracer-bmw-r90s-replica-cockpit-fairing---full-kit
Otherwise Motorworks and Motobins are go to for parts.
I can probably point you in the right direction if it turns up with problems, I've been spannering mine for nearly 20 years now.
Snowbum who owns the website I linked at the top is mental as a resource though, I always read his articles before I attempt a repair. He makes such a meal of things but it helps to pay attention to things like pre-loading front wheel bearings.
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Not sure what is on mine.
Mk1 Le Mans I think https://smgmedia.blob.core.windows.net/images/113420/640/moto-guzzi-le-mans-742b8ae2b4b5.jpg
Or early 900 Sei https://en.m.wikipedia.org/wiki/File:Benelli_900_Sei_orange.jpg
Other Italian bikes of that era had the same fairing I think. Maybe it was made by an Italian aftermarket manufacturer. It always seems to be in orange but on a red bike!
Actually looks a bit better as I've since put new rubber on it and cleaned the pipes.
Noticed the thin gaiters on yours, they match an R90S style fairing. Mines a motorworks version from a while back but you need to be very careful with the fitting kit and the bars. Some bars don't work with the kit. It took me ages to dial it all in.
I'm a huge fan of the S fairing though. Transforms the bike for me, especially if you have more aggressive bars like the R100RS bars. Had to go as far as limiting the handlebars because they would make contact with the tank.