Which one? All OEM Triumph ones use the same Fork Fixing kit of 4 clamps and then you can get a now out of production Summer screen a bit smaller than the full sizes Roadster or Classic screen which fordt came out as an R3 Standard screen accessory then fitted pre-delivery to Classics and still sold for Roadsters.
The painted Flyscreens also use the same Fork Fixing Kit and have come in every color imaginable in the time but are now only available readily in Phantom Black (with a little sparkle), and Matt Black. Striped White on Matt Black and Striped Red on Phantom Black versions may still be available at limited places. there is also a clear version of the flyscreen called a 'Sports' screen.
The Flyscreens and large screens come with their own chrome brackets but I have made up some Black stainless bracket versions kist with black chrome bolts and OEM Phantom Black screens all parts new unused.
For Sale - New Phantom Black OEM Flyscreen & Custom Black kits
I have the large screens used and clear 'Sport' flyscreens used and new too.