Motorcraft stk 21 - Alternative spark plugs

There are 85 replacement spark plugs for Motorcraft stk 21. The cross references are for general reference only, please check for correct specifications and measurements for your application.

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Replacement spark plugs for Motorcraft STK 21 on Amazon

The spark plug Cross References are for general reference only. Check for correct application and spec/measurements. Any use of this cross reference is done at the installers risk.

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