This is THE most complete and easiest to install MONZA CAP GAS TANK ADAPTER.

Allows you to fit our 2 1/2" Monza Gas Cap onto your Triumph Gas Tank

Fits 

Air-cooled engine : Bonneville, T100, SE, Thruxton and Scrambler models 2000~2016 

Water-cooled engine : Street twin, T100, T120 ,  Scrambler, Thruxton Bobber models 2016~