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1999 Ford Mustang - Spark Plugs

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NGK Iridium Plug Number CR9EIX Spark Plug - 3521

Part #:: 3521
Line:: NGK

1 Year Limited Warranty

Metallurgy: Iridium

Service Number: CR9EIX

Center Electrode Tip Material: Iridium

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NGK Copper Plug Number CR9EB Spark Plug - 6955

Part #:: 6955
Line:: NGK

1 Year Limited Warranty

Metallurgy: Copper

Service Number: CR9EB

Center Electrode Tip Material: Nickel

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Champion Copper Plug Number RG6HCC Spark Plug - 388

Part #:: 388
Line:: CHP

2 Year LIMITED WARRANTY

Metallurgy: Copper

Service Number: RG6HCC

Center Electrode Tip Material: Copper

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Autolite Xtreme Sport Spark Plug - XS4322

Part #:: XS4322
Line:: ATO

Metallurgy: Iridium

Center Electrode Tip Material: Iridium

Ground Electrode Tip Material: Nickel

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Autolite Xtreme Sport Spark Plug - XS4322DP

Part #:: XS4322DP
Line:: ATO

Metallurgy: Iridium

Center Electrode Tip Material: Iridium

Ground Electrode Tip Material: Nickel