um.... they do not require bar-ends.... I dont understand why you couldnt mount the mirrors directly on the ends of the bars.... I wasn't prepared to do away with my tapered Rizoma bar ends coz I like em too much, but coz they are tapered obviously you cant mount bar-end mirrors on them. Soooo I took 'em off mounted the mirrors directly on the end of the bars using the larger bush that came with your mirrors, and put the bar ends back on the ends of the bars! Simple. I have Rizoma grips though which are 8mm shorter in length than the original ones, giving me just enough bar end to bolt the mirrors on to..... Hope that helps, but its definitely possible to put the mirrors inboard of barends.... as you can see from my pics.
Well that's the same method I tried, but with the larger bush on my handlebars, the mirrors couldn't quite fit. They were VERY close to being able to fit, but the with the larger bush it was just too wide for the mirrors to be slipped/pushed on to the ends. I even tried going at it with a hammer (a towel protecting the mirrors of course) but it just would not go on.
That's why I had to mount them on the bar-ends.