That's what I have fitted currently, but they are very poorly made and no matter how tight I tighten the screw, they gradually drop down and give me a great view of the side of my fairing!
They also vibrate a lot more than the originals and I nearly ran into the back of a car whilst trying to make sense of the blurred image recently:
(hmm...is that a police car behind me? I can't quite make it out......OHMYGODIMNOTGOINGTOSTOPINTIME).
All in all, I'd like to put the originals back on.
I had similar troubles with my halfords replacements but thought it was just bad luck of the draw. In the end I managed to use some washers to get the screw tightening properly. However replacement ducati mirrors are extortionate so I'm not sure what to suggest for you now.
My original mirrors are in superb nick, I spent ages cleaning, filling and re-painting them. They look great. It was only when I removed the masking tape from the mirror glass that I realised that the glass now let's the rest of the mirrors down!
That's why I'm after just the glass.
BTW, I found some original SS mirrors on Fleabay for £100!!!!! [laughs till he falls of his chair]