Thank you for the tips fellas, I might know a guy that still has boxes of lodge plugs in Vic. Does it have a cover or guard? I don't see where one would fit though and it seems the wire type of thing it has now has always been there?
A strange looking thing yes and again, really heavy . Didn't old Fords have 18mm plugs too ? Going to give it a bit of a clean tonight, to see if i can find more info stamped anywhere . Thanks again.