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I'd use the type spark plug recommended by your owners manual, the manual may also give you the gap. There may be a decal under your hood that gives this info. Anywhere you buy sparks will have the gap in the info. For one ngk plug I looked at, it said .043in gap.
Different spark plugs manufacturers may have different gap recommendations.
If this is sparking out of what appears to be unexposed (covered) portions of the spark plug wire replace the wires. It might also be a good time to change the ignition cap and rotor as well. It may be "sparking" out of more places than you know. To test this start the car and watch the under hood in the dark or very low light.
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