Suit GU TB48 Motors & Y62 VK56 motors
This is O'Ring located between the metal water pipe on the drivers side of the engine and the cylinder head on TB48
It goes into the cylinder head between the number 1 & 2 intake pipes of the manifold.
On Y62 with VK56 its located between the metal water pipe on the drivers side of the engine and the thermostat housing.
We also sell the Oring for the metal pipe that joins to the thermostat housing, available separately in our online store.