The manifold has a reusable rubber gasket that will likely stay right in/on the manifold when you pull the elbow - it sits in a channel on the manifold and is meant to be reusable. But if you add a spacer, you'll need a paper gasket between the elbow and the spacer...whichever one you buy SHOULD come with one, but you could always make your own with a sheet of paper gasket material, a knife or scissors and a hole punch (or just use a old bolt and block of wood to punch the holes for the manifold bolt holes (which, by the way, should be included too as these will need to be longer than the originals).