Slant 6 plugs sold as a set of 8??

haha... So for YEARS, like 3 decades worth of years, I have had a set of NOS MoPar spark plugs in the bottom of my tool box. Never really paid any attention to them, other than to know they are not the set I have for a 383. So today, I got them out to put in a 318, and only after I opened them all, did it dawn on me they are for a slant 6.

Why in the world did they sell sets of 8, if they are for a slant 6?

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