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.
Fits: > All S&S engines with 12mm threaded spark plugs; 99-17 Twin Cam; 86-22 XL (excl. 08-12 XR1200)
