27 posts and not a single correct answer. This site is getting shitty.
You can't put a spacer between your sprocket and your crank! The only spacer that should be there is the shim if you have a 22mm sprocket going onto a 19mm spindle, and usually that is on the inside anyways. If you put another spacer there, the only way it would work is if you ALSO put a spacer on the sprocket bolt. Otherwise, you're going to go to tighten your sprocket bolt, and it's going to bend your sprocket into the crank, because the crank is going to be too far from the sprocket. The only way to do what you're saying without spacing BOTH the sprocket and the sprocket bolt is to buy a Tree sprocket, I'd think.
Christ guys, don't talk when you don't know what you're talking about.