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Joined: Tue Dec 5th, 2017
Location: Michigan, USA
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And yet even Rockauto say that's only for up to 2003.If I am understanding correctly, the OP says his truck came new from the factory with the SP432s. To me, that would carry more weight than what a later parts list says.
Unfortunately, Ford stopped including the spark plug numbers in the 2004+ owner's manuals. Just a note about "see your dealer", making it impossible to crosscheck that way.
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2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals, BW4406 manual T/C
Aussie Locker, Torsen L/S, 4.10's, Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, sway bar discos, Heated seats, Explorer EATC, Trip Computer and consoles
Other rides:
2016 C-MAX Energi (plug-in Hybrid)
2011 Taurus SEL (highway cruiser)
2003 Ranger 2.3L M5ODR1 Regular Cab (drudge)