My riding buddy Porter ordered a new knob for his 2001 Bonneville and got the same part which is not correct; there was no other choice in he parts fiche. Triumph must have changed early on to a screw mount from a press fit and I have no answer on how to source the proper item.

A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)