I wondered about that. I've got a pair of gixxer 600 mirrors I had on my Yamaha. I glanced at the base of the Ninjas mirrors and figured they would fit. The stalks are prolly 2 inches longer nearly. They seem to be the mirrors everyone uses to replace stock.I fitted (genuine) GSXR mirrors to mine so's I can have an idea what's behind me. They do not look a lot different to stock on the bikes silhouette - but they have slightly longer stems and a slightly bigger head so they work better. The stems fit straight into the stock ZX10 mounts as well.
cp post pics when possiblei havent seen the ones your talking about, but i do like these a lot. Ill be picking up a pair as soon as i can