You can order them here: http://www.fel-progaskets.com/default.aspx?referrer=google

You will not need valve stem seals. The Felpro gasket set will have everything you need. When cleaning the gasket surface be careful not to scratch the soft aluminum. A green scotchbrite pad, a roll or the blue through away hand towels from the automotive department, and a gallon of mineral spirits from Wal-Mart would be perfect for cleaning the gasket mating surface. Be careful to keep things clean and don't drop anything into the valve compartment.