Scott, you can buy gasket paper at any automotive shop and cut it out yourself. If you have the old gasket, just trace through holes and if not, just coat the surface with water soluble paint (ink...anything) and let the surface "paint" your pattern for you.

About the sealer, I always use "gaskacinch". It's a little harder to find, but works beautifully with a really thin layer (looks like phlegm.......blechh) and if you coat both surfaces, allow it to cure, then place them together, you'll have no problem putting the pump together without the gasket shifting.

Hth!