I also own a 2007 DL-650.
You may be able to find a generic seal for the countersprocket. You won't for the clutch push rod seal. If one is leaking, the most likely culprit is the clutch push rod seal. If it is the countersprocket seal, you also want to replace the o-ring -#51- that sits inside a groove on the countershaft, sprocket spacer -#48-.
If it is the clutch push rod seal, a temporary fix is as follows:
1- Remove the front sprocket cover: three 8mm screws.
2- Remove the clutch release mechanism; two 10mm screws.
3- Remove the clutch push rod.
4- Squirt a little grease into the clutch push rod opening.
a- Don't start the bike when the clutch push rod is removed. Oil will pee all over your boots.
b- Before doing this, let the bike cool down.
I have just finished replacing my clutch release mechanism, clutch release push rod, clutch push rod seal, countersprocket seal and sprocket spacer o-ring. I have taken photographs of the whole procedure. I am planning on writing up a tutorial on how to do this. I am just not ready to invest the time yet. However, if you need some assistance and you feel some photographs other then what you find in the service manual will be helpful, I got a boatload of them.
, if you take a look at the online parts fiche, (all of this is under the heading "transmission"), you will notice a metal "seal retainer" that is applied over the clutch push rod seal and the countersprocket seal. There are three 10mm bolts that hold that in place. The aft two are easy to get at. The forward one is a royal pain in the ass. There is no tool that I own that could get in there to remove or reinstall it. I made my own.
I purchased a cheap 10mm socket and cut it in half height-wise. I then made a handle out of some scrap angle iron steel I had and welded the "short" socket to that.
The handle let me fish the socket in to place and loosen the bolt.
The metal plate I am talking about is part #40 in the below diagram. (The red arrows were for identifying the C.S. seal and s.spacer o-ring for when I ordered them.)
To install that difficult bolt, I finally ground a slot in the bolt head so that I could insert a flat screwdriver blade so as to tighten the bolt enough to get my special wrench on it to finish the job. There was no way that I could get any other wrench or my fingers in there to deal with this bolt.
This is what the metal seal retainer looks like.
The difficult bolt I am referring to is the one over the clutch push rod seal. You can also see some grease around the push rod seal. Mine was leaking too and I used the temporary fix that I mentioned above.
Let me know if I can be of more help.