Got the really cool stencils today. Thank you Cycleranger!!
Just need to decide if the silver Rustoleum engine paint will work, or if I should get some special vinyl spray paint.
When I did the later stencil on my 450 seat I used standard silver paint, but my seat doesn't flex much at all. I'm thinking yours might need something that will stay flexible, unless the flat rear of it doesn't really get much movement when you're sitting on it.

