Originally Posted by leggyman17
What gasket is that?
As I recall (it's been over five years) it is the gasket supplied by Perrin with the TMIC... which I used in conjunction with the OEM O-ring.
But there are other options, which have been variously mentioned. They boil down to thermostat gaskets for Chebbies.
Also, making one's own is pretty simple... most auto-parts stores sell the materials.