Hi Bryn, I have the Bark Busters on my 1200, and yes, they fit over the standard handguards. I bought them for Denise's 650, but they don't fit over hers. Prior to that we both used cheap Oxford muffs, which really do make a difference to how cold your hand get. I think it is more to do with taking away the wind chill factor than the actual fit of the muff (ooh err) as we both prefer to have the hand hole wide open. The Bark busters were for Denise because she struggled to find the start button with the muffs on, I find them slightly less effective than muffs, but better than nothing. Unfortunately, I cant seem to find a photo to illustrate the difference.
Mark