When installing new parts or servicing an engine, reliable gaskets, seals, and o-rings can be one of the most important elements on any job. Gaskets which seal and perform reliably are essential; no one wants to suffer avoidable leaks and performance loss. Zipper’s Performance Products sells gaskets and gasket kits from notable manufacturers like Cometic®, James®, and S&S® for all Haley-Davidson® engine types. Zipper’s Performance stocks most all gaskets, seals, and o-rings individually for 1966-up Big Twins and 1957-up Sportster® engines. (Individual parts are available by phone or email only.)