What's a good mirror for drop-bar handlebars that have bar-end shifters?

[Horizons]

I need a mirror that can be attached to the "horn"--I don't know what it's called--of my Surly Disc Trucker's handlebar. I have bar-end shifters, so can't attach a mirror there. I much prefer mirror attached to my bike than to my helmet. Thanks for recommendations!

 

[Sea of vapours]

Zefal spy mirror. I don't have bar end shifters, so can't be certain that this will work, but I do have one of these mirrors and they're excellent. You won't have a problem attaching it, nor in seeing in it. The issue I can't be sure of is whether it would interfere with your ability to use the shifter.

 

[Domus]

I have one of these ⬆️ on my tourer, easy to flip on to the other side for riding in foreign parts.

 

[Ming the Merciless]

B&M cycke star 60 mirror with long arm