just got my motot rebuilt and the guy who rebuilt my motor said that he was having a hard time finding the freeze plug that went on the back side of the motor that coverd the camshaft. so i took the motor up to orileys measured the diameter of the hole and it was a little over 47 mm. just could not find it they had some close ones but none that fit. so as i was searching i called toytoa and they claim its a 50 mm plug. my question is does anybody know where to find the right one or know the exact size i need. i have never changed out freeze plugs before and also if sombody could tell me the exact procedure on installing one.