So you have a  thermocouple that has one Large and one small male pin and all you can find are thermcouples with both small male pins.   Take the "old" thermocouple and cut off the  LARGE connector at the end of the brass tube,  Slide this brass tube onto the WHITE connector pin of the new thermouple and then plug this back into harness.
 
NOTE!
  This is for Non-certified applications only !