Clip-on Handle Bar Question

[sikatri]

My 2005 Triumph Thruxton comes with clip-on handle bars. I’m trying to research what handle bar end mirrors I can install. I think some models of the Thruxton came with them from the factory. Anyway, when I remove the end weight there is a solid bar under it. No recess. I have not found the exact picture in the manuals, some show a recess in the drawings at the handle bar end. Here’s what mine looks like. It just doesn’t match with what I’m finding in literature.

 

[sikatri]

Halcyon 830 is one I've been looking at:
https://www.retrobikegear.com/halcyon-830-bar-end-mirror-stainless-steel/Another is CRG:
https://newbonneville.com/shop/crg-bar-end-mirrors/
I'm still trying to figure out if either can be made to work on my handlebars, clip-ons. The Halcyon appears more classic and would be my favorite. I need to do more research on which thread type is on my bar first.

 

[sikatri]

Also a bit puzzled that the particular Halcyon mirror I was looking at and a few others say they are not for road use in the USA. That seems odd. Wonder if they have any that are?

 

[sikatri]

I went with the 4" Halcyon mirrors. Found there was a shallow adapter made to fit my bars.
https://www.moto-amore.com/shop/halcyon-4-round-bar-end-mirror/No indication of any disqualifying reasons. Perhaps 4” round is more acceptable. I will have to check the size of my originals.

 

[sikatri]

The mirror is great! The bolt though was too big. Had to go to the hardware store and get a stainless 5M bolt. Didn’t want to retap the thread. Otherwise really impressed.

Last photo with the new bolt.