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OEM NGK are hard to beat, gap is listed in your owner's manual. :D

Spark Plugs (6.1L) PLZTR5A-13 (Gap.050 in [1.27 mm])
 

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Factory/OEM plugs are the best way to go.

They were put in the car for a reason, and may not be the "cheapest", but they WORK.
 

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I was gonna say, the part number I provided IS the NGK part number... :D
 
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