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It is all in the Numbers 
http://www.ngksparkplugs.com/docs/tech/design_symbols_plugs.pdf
You beat me to the answer. 18mm is the winning size.
Thanks
The size is 18 mm....Just replaced my plugs yesterday
The spark plug gap is 0.8-0.9mm. I had to buy a special socket to fit my 2002 1500. I believe the socket size is 19mm, but it could be 18mm.
Anyone know the metric socket size required for the spark plugs along with the Gap setting. Thanks
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