Marilyn.
Look at the head near the injection pump side in the area between plugs 3-5. Correct me if I'm wrong.
Should be right there. Look for a 14mm nut with a short head coming out and an even smaller head with a bit of copper color peeking out. Not sure how much was cut off.
Might be upright in an aluminum extension block or sideways into the head itself.
Overall length of the plug should be around 5-6 cm .
Merry Christmas to all.
Walter