I'm confused. I bought a 2005 XR650L three weeks ago, and have been adding things to it. My Clarke tank came a couple of days ago. The stock tank has a 3/4 inch (or so) male outlet stem to mount to the petcock. The Clarke tank doesn't have anything. Just three holes drilled in the tank. All in a row - the center hole is larger than the outside holes. Am I missing a piece that should have come with the Clarke tank?