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I used the SP-548 for my replacement. At the tyme I was told these were the OEM replacements for my 2012 Boss but I didn't get the part number from the manual. They work just fine.
FYI - the OE plugs on 99.9% of Ford applications from 2010ish are already NGK. I am the engineering manager at NGK and that is my account. Most of the older FoMoCo plugs show our part number on the metal shell. However we just stopped doing that.
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