12mm threaded long reach. Made by Champion. Used with 18mm spark plug socket. Stock resistor replacement spark plugs for S&S engines. Endorsed by S&S Cycle Inc. to be used in all S&S engines and stock H-D engines. Heat range is correct for all S&S engines. All S&S engines with 12mm threaded spark plugs 99-17 Twin Cam 86-22 XL (excl. 08-12 XR1200)
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All S&S engines with 12mm threaded spark plugs; 99-17 Twin Cam; 86-22 XL (excl. 08-12 XR1200)