O-ring Gasket Replacement
 

Where can I get an o-ring replacement for my leaking crankshaft position sensor? I already checked with napa and a couple of auto stores that tell me to go to the dealership. I figure there should be some generic gaskets in a variety of sizes somewhere without having to buy a whole new sensor.

The dealer does not sell the o-ring, either.

What if I used rtv around the outside of the sensor then? I know the rtv container says its sensor safe.