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See: https://pyramid-plastics.co.uk/collections/moto-guzzi/bike-model_v85-tt
Fitted 22nd October 2022 at 17,050 miles, Pyramid Plastics V85TT Splash Guard is a quality lightweight product that prevents spray from the rear wheel depositing dirt all over the rear light, number plate, luggage rack/top box and the rear of the seat.
The only thing to add to the clear and concise instructions shown below, is the fact that I used Loctite 243 blue on the M8 fasteners and torqued them to 20Nm.