Ok - I emailed Champion to confirm the right plug for an 04 DII w/ 4.6l, and the Champion 7070 will work. NAPA has them for about 5.99 and their parts finder does list them as a compatible replacement for the 04 DII. I also picked up a set of Kingsborne wires - got a great deal on them and since I'm local I just picked them up at the factory in San Marcos.