This item includes :

1set full gasket kit

4set Piston Ring Set For 4 pistons

We also can supply the following parts for Yanmar 404C Diesel engine rebuild , any parts you need , please let us know:
 
Piston , Piston ring , Cylinder liner,
Full gasket kit (including the head gasket and all necessary seal ),
Valve (intake , exhaust , seat and guide ),
Bush , Main and Con rod bearing .
Water pump , 
Crankshaft  , Connecting rod.