Keith: Triumph designed their own proprietary aero screens. They were produced to fit into threaded holes in the scuttle IIRC up to approx. TS30000.
The shape of the TR screens is totally different from Brooklands. There's a guy in the UK who sells a conversion for the Brooklands screens. Here's a photo of my original aeroscreens and the Brooklands.
Note: The original TR aero screens used the same gasket as used between windscreen and scuttle.
My Original TR aero screens
Brooklands screens
My screens with proper rubber sealing strip