Mirrors just don't work well with narrow bars...the only thing you can see are your shoulders. Any mirrors that will let you really see would look like crap...because the stems would be so long. Been there, done that...the only real cure is wider bars.
+1 - I've also wasted money trying to get mirrors compatible with drag bars. The only solution is wider or higher bars.
licks 3 inch round ones are the best imo....they are so adjustable they spin on shaft or up down and turn the mirror...i only run one and can se behind me and almost to the other side.....i love em and they are only 20 bucks