At one time I went through a bar end mirror phase - the best I found were those from CRG, first the HS (hindsight) and then the LS (lane splitter). Very well made, with all parts replaceable. Excellent product. They also made a small plastic bar end adapter for such bikes as ours. I would get mine from Bevel Heaven. Corsa Italiana (since out of business) also made a pretty billet adapter to fit. See the photo. I could not adequately compensate for the far view of the reflection - made traffic look a lot further away, and ended up going back to mounting mirrors in the stock posts.
Surprisingly, I found the stock mirrors give a much betterview with low bars, than they do with standard bars - can see around arm & shoulder.

Other excellent ones to look out for are the glassless ones from Motogadget.