single wire sensor on the back of the engine?

[cadikiller]

Does anybody know what this sensor is called. I broke the retainer for the pin inside the connector and I am looking to get a replacement. Single wire sensor grounded through the engine I'm guessing. There is one on each head. Thanks

 

[chris2523]

it is a noise filter for the coils.
to keep the coil whine out of the radio.
i don't keep them around.

 

[cadikiller]

Thanks