Quote Originally Posted by series1buff View Post
The metering plug often goes missing as people pull the head off and the plug falls out .... it is a tiny part , and on the ground among dirt and leaves , it is overlooked when the head is put back on

The bolts are the same I think .. but the lower one holds the oil pressure sender unit ... will have to check that before a definitive answer

Mike
same thread ,hole etc but the pressure switch one is at least a cm shorter