jthistle -
Motorcycle mirrors are another option :
eBay Motors: 1998-2002 SUZUKI GSX 600 750 KATANA CARBON MIRRORS (item 180276820237 end time Aug-15-08 22:23:37 PDT)
From my POV, the thing to keep in mind is that you have to make sure that the mirrors will turn enough to be usefull, because their mount point on motorcycles isn't the same as the mount point on a car.
CarloSW2