Crank sensor leak

[rjc1629]

So I've had an oil leak from the front of the engine for a while and after replacing all the seals up front I have determined that it is coming from the crankshaft position sensor. There is an o-ring that goes around the sensor and seals to the timing cover that looks like the culprit. Does anyone know where you can get a replacement without buying the whole sensor? I tried the parts store ones, but they where too fat. This o-ring looks flat on the sides. Any help would be appreciated.