Strictly speaking, the 2002 T100 Centennial was not influenced by any (Meriden) T100 500cc twin. The use of the name T100 as applied to the Hinckley Bonnevilles started in (and is a reference to) Triumph's centennial year, 2002, the company having been formed 100 years earlier in 1902. I have had many an old duffer ask me why my bike says Bonneville T100 on the side, when back in the day they were a completely different range of bikes. As has been said, the '69 T120R looks a more likely influence.
Aubergine & White 05 T100 (865cc) with numerous mods.
(Previously Ducati Monster S4 and several UJMs)