TPI carries everything you will need:
Click on the Clutch/Engine link to get to the page with the parts.
I do not recommend using sealer instead of a gasket. If you are careful removing the side casing, 9 times out of 10 the original will be fine.
You will also need the flywheel puller. That is the big black looking bolt. They are extremely difficult to find at a hardware store, due to the thread pitch. It's easier to just go ahead
and purchase it when you get your doo. As for the special wrench to hold the flywheel, a cheap 1 1/4 wrench from an auto parts store worked just fine.
Two people make the job MUCH easier.
This link will give you step by step instructions. It is not a very difficult thing to do, just take your time and go slowly and double check everything.
Hahaha, as for a recall, this has been discussed for "many" years. Big Kaw is not going to admit there is a problem, never have. Altho on the new 08's they did redesign the doo a bit, but it still is not top notch and the spring is still a bad design that lends itself to breaking. Eagle Mike's replacement is the best there is and is time proven. Once it is in you never worry about it again.