Gasket Kit T/E O-Ring Head Yz65Top End Gasket Kit O Ring Cylinder Head GasketTop end gasket kit includes correct base, head gasket and cylinder O rings as well as other top end specific O rings or seals needed for R&R of top end Materials will vary depending on what is correct and engineered for specified application Purchase a top and a bottom end gasket kit for a complete gasket kit when doing a total engine rebuild