[Jeff Alton]

You can get the tube seals here at Pelican, and I assume the correct sealant as well (though I have not had checked to see if they have the correct sealant). You will need a few other seals if you are pulling the cam cover as well. You could also get new tubes if your are cracked.

You could also check with a local Independent service facility, I am sure they could supply you with what you need, and offer advice and guidance at the same time!