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Suit All Nissan Patrol TD42 and TB42 Motors and Nissan Navara TD27 & QD32 motors.
This is one of the Gaskets with an O'Ring required for the Oil Cooler Assembly.
There is two of these needed on a TD42, and they are both different but similar.
On a TB42, TD27 and QD32, they use two of these same gaskets with oring.
Generally both are required to be replaced when the oil cooler assembly is removed.
It is common for the Oil Cooler Assembly on the side of the Engine to leak, and just replacing one of the Orings normally doesn't do the trick, it is best to replace the whole oring and gasket set.