MCS-931681 - 14mm threaded; long reach. Made by Champion. Used with 21mm 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 engine

Fitment:
All S&S engines with 14mm threaded spark plugs; 75-99 B.T.(excl. Twin Cam); 72-85 XL (NU)