I have Fast Eddy's Emgo mirros on my America and Oberon Streetfighters on my Bonnie (semi-cafe) and I like them both very much. The Emgos fit the original stems perfectly and give a great field of view; the Oberons are "dental" mirrors but are actually a lot more useful than you might think. I did use open end bars for the Oberons and it made installation easy; they are, however, the devil to get situated properly without a helper.
