Gasket #19313-PY3-000 (between the top of the water pump housing and the bottom of the thermostat housing) and o-ring #91312-PY3-000 (at the back of the thermostat housing) are also needed but are serviced separately. Order 1 of gasket 19313-PY3-000 and 3 of o-ring 91312-PY3-000 when installing this water pump.