I am putting the catalytic converters back on the engine now and I can't find a source for the sealing rings that go between the cats and manifolds. Does anyone have a part number for those, and are they dealer only?

 

Alfa, I would think that they would be fairly generic for the size pipe that is on the car. Measure out the pipe and see what you can find at the local auto parts store. Worst case, look up the sealing ring for an 02 Lincoln LS with the 3.0L motor. That should be roughly the same part as the Lincoln 3.0L and the Jaguar 3.0L are very similar and the 3.0L and 2.5L Jaguar engines are almost identical. So, should be golden at that point.

 

Should be these, but might want to double check
Exhaust Flange Gasket - C2S2695