Spark plug · Mopar
Equivalents for the Mopar spark plug PARTS 4339420
Mopar PARTS 4339420, a spark plug. Find its 177 compatible and interchangeable spark plugs: cross-references for NGK, Bosch, Champion, Denso and every brand.
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What can replace a Mopar PARTS 4339420 spark plug?
The Mopar PARTS 4339420 is interchangeable with: NGK BR5FS, Bosch HR8A, Champion RC8C, NGK BR5FS15, NGK YR5, NGK YR55. These spark plugs share the same mounting (thread, seat) and heat range.
Cross-references and specifications are provided for guidance only. The wrench size can vary by brand, and some data is inferred from the plug code or an equivalent reference. Always check the vehicle manufacturer's recommendation before buying and fitting.