The gaskets that go into the expantion chamber on my Tri-z are missing. While at the bike shop today I had them look them up and the first gasket as they call it (which looks like some kind of metal reducer) is discontinued. Looks like they can still get the donut looking gasket thought. My question is does anyone know of an aftermarket peice that will work? Maybe something from another model? Also if I decide to buy an aftermarket exhaust for it will I need these gaskets from the stock pipe or will the new pipe come with them or will it even need them. Any help is appreciated