I searched PET catalog to no avail. Does anyone know the part # for the gasket under the plate below the driver's side fuel dampener. There's a water passage there. Pic attached to show the location, it's basically under there.

 

In the PET pic it only shows the gasket under the neck to the heater valve (#15). IIRC it is the same gasket for the other side. I had replaced both some time back.

 

I think this is the plate you are talking about-



As MainePorsche suggests, position # 15, 928 106 167 01