I questioned using them but in the end I didn't. The best thing you can do is get real motorcycle mirrors. None of that aftermarket crap. Only stock mirrors seem to have stock quality. Everything else vibrates like crazy.
I like my mirrors. They are from a Kawasaki Mean Streak 1600. I figure if they are good enough for 1600 then they are good enough for a 500.
Where'd you get yours? I looked on EPray but it looked like even the crap sold for Kawasaki bikes were aftermarket.