Don't have all the answers on part numbers off the top of my head, but the original plug is a single tip plug (use only that) and the gap should be 1.0 mm.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record