I'm not sure if the clip-ons will work if you've got a fly screen installed. I installed a drag bar on my bike only to find that they hit the fly screen. It would seem higher bars are needed to clear the screen. There might be other clearance issues as it's pretty cramped where clips-ons would go...
Bristis-Customs makes bar end mirros for the bike. There's probably more manu's out there, but I know of these guys.
http://www.british-customs.com/crg-f...1-pr-1548.html
But I think all you need is a 7/8".