Are you talking about the filter adapter? On mine, I ended up needing to use a piece of 2" PVC, about 2 1/2" long, and an extra 2" flexible pipe coupler (the rubber ones with hose clamps), to clear the flywheel and shroud. I also drilled and tapped the PVC to 1/4" for a hose barb, and connected the breather tube to it. This was for an Intek Twin.