Or you can say screw everyone's advice and combine them all to have ultra superior seals.
Put a bead of gasket maker(the red one). Put on the metal gasket. Finish it up with another bead of gasket maker(the grey one).
There is no way you can go right. Because if you use them all you know atleast your using the best one.
There is no way you can go wrong.
Edit.
My phone won't let me use the edit feature.