OK, d00d...don't say I never did anything for you, bro...

Here's what you'll need to mount either the 2820 or the Zumo: 30997MC Mount (the C indicates chrome, of course) will get the handlebar clamp, the stem, and a backplate.
The accesory chrome backplate with the AMP hole pattern is part number 60991C. I have not had a Zumo in hand, but believe that it comes with a cradle. The 2820 does not come with a cradle, so that is a serparate piece. If you go that route, I'll get you the part number for that as well. If you mount all this on the left bar, you can use a cigarette lighter adapter (what I use), available at Radio Shack, any marine store, etc. Mine has the small blade type fuse. This way, you can make up a power supply which will just unplug and remove. You can also opt to hard wire it to the back of the cig lighter as well. If you don't use your cig lighter for anything else, it makes sense to me to go the route of easily removable. If you want to utilize the voice commands and MP3 capability of either of those Garmin units, you'll need a 3.5mm stereo patch cord to run from the output on the Garmin to the Aux Input on your radio. It's a tiny little cord...I've got mine run through the clutch line hole in the fairing, so I can just push the excess wire in the hole, leaving only the connector showing (hardly visible).
The reason I put mine on the left side is because if any view is blocked, it's of the Rain Gauge...and it's closer to a readily available power source.
The mount is a qualtiy piece, so you will have no issues with it being on the
This post is revised effective 3/10/07...the part highlighted above is NOT needed, as the mount will come with the proper chrome plate...just be sure and tell them you want the chrome mount with the AMP bolt pattern and you'll be good to go!! Thanks to Philippe for confirming this with Techmount!!