Thermostat housing Gasket 5.7L (CES engines) and ZR4 (6.0L) w/ raw water cooling systems

Thermostat gasket for  CATANIUM® Clean Emission System (CES) PCM 5.7 L motors and ZR4 (6.0L) w/ raw water cooling systems. PCM 5.7 WITH RAW WATER COOLED CES (CATALYST EXHAUST SYSTEM) UPPER THERMOSTAT HOUSING GASKET. Catalyst exhaust started 2008 in California and 2010 up Nationwide.