Which are the correct spark plugs?

I use them in my v8s and must say they are the best by far, when i used my first p6 as my only car managed 30.000 miles
on them.
Kept taking them out to check gap and only changed them because externaly they looked very old.
We use NGK at my works and never had any failers unlike the champion plugs!
Clive.
 
Excellent! I ran into an issue though. My tool isn't able to get to them. It's metric. Any idea where to find the proper tool that fits.
 
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