Be careful regarding some recent changes to filter designs
The design of several - K&N, Bosch, Purolator (amd maybe others) have change the profile of the threaded adapter
The new convex profile (on the right in both images) will NOT seal when used on the Triumphs.
The thread will become tight at end of its limit of travel before the seal makes proper contact.
They have changed the design but NOT the part numbers, so you need to physically inspect it to see what revision you might be buying.
So keep an eye out for that with your after-market replacements
I recently installed a new Purolator Pure One and I was fortunate it must have been older stock (was unaware of this issue until after I installed mine, which fortunately did not leak!)
I have not seen any news that the Mobil1 is following suit, but keep an eye out regardless.