Hate to dig up an old thread but just in case anyone digs this thread up in a search in the future, I finally replaced the seal and fixed the leak. I got the part number for the seal from bikebandit.com and went to my local Honda dealer (who are usually really cool) and tried to order the seal. They said it was discontinued and Honda didn't make it any more
Well I went to bikebandit and ordered the seal and a few other things (they have good prices on tires so I bought a new set of MX51 tires too) and the seal shows up on my door step in a week. So I'm not really sure what the dealer was talking about. I had never ordered anything from bikebandit.com but they turned out to be a pretty good site. They didn't gouge me for shipping even with the tires and they sourced the seal I needed too keep my right foot from getting all oily when I ride! Nice.