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1998 Pontiac Firebird - Spark Plugs

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NGK Iridium/Platinum Plug Number ITR4A15 Spark Plug - 5599

Part #:: 5599
Line:: NGK

1 Year Limited Warranty

Metallurgy: Iridium/Platinum

Service Number: ITR4A15

Center Electrode Tip Material: Iridium

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ACDelco Iridium IP Spark Plug - 41-101

Part #:: 41-101
Line:: ACD

7 Year Limited Warranty

Metallurgy: Iridium/Platinum

Center Electrode Tip Material: Iridium

Ground Electrode Tip Material: Platinum

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ACDelco Iridium IP Spark Plug - 41-993

Part #:: 41-993
Line:: ACD

7 Year Limited Warranty

Metallurgy: Iridium/Platinum

Center Electrode Tip Material: Iridium

Ground Electrode Tip Material: Platinum