Just go out and buy some valve cover gaskets from the dealer ( I think like $30. Dealer is only place that carries them i think). It comes with new gaskets and new o-rings. Make sure to scrape away all the old silicone on the heads first before putting the new ones on. The new gaskets should be installed dry and the new o-rings with go on with a nice big socket and hammer. Dont be afraid to hit the outside edges, they're just metal underneath the rubber