it has to be carbon fiber or red and have turn signals on it.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=4504531070&ssPageName=STRK:MEBI:IT
Try www.denniskirk.com they seem to have a bunch of aftermarket mirrors.
no luck..anywhere else? it must be a popluar item since it incorporates the turn signals.
Emgo (www.emgo.com) has a bunch of mirrors, it's worth a try...