Nissan Genuine OEM S14 SR20DET and P12 SR20VE Spark Plug Well O-ring Gasket 
Genuine OEM Nissan Spark Plug Well Gasket. Prevents oil dripping into the spark plug wells and fouling spark plugs. Keeps oil where it's supposed to be.
 
The S14 uses a conected O-ring configuration, it requires one. The S13 requires 4 individual, seperated gaskets (part # 13271-52F00)