Here's a new Front Timing Cover Oil Seal (x1) for the following models from Triumph -

TRIUMPH

Triumph 2000            (2000cc, All)

Triumph 2.5pi            (2500cc, All)

Triumph 2500 S / TC (2500cc, All)

(The external diameter of this seal is 7.5cm).

(Note - Triumph also used an earlier type of Oil Seal for the 4 cyl models, ensure your model is listed below, I have the earlier smaller Oil seal in my other listings).