Champion, Copper Plus spark plug. RN12YC L79-80 B.T. (NU) Indian: 02-08 Chief/Deluxe/Springfield/Roadmaster/Vintage 2009 Chief C

4-pack. (5R6A). 14mm threaded 3/4" (19mm) long reach. Use with a 21mm spark plug socket. Copper-core center electrode with the patented SAC-9 semiconductor resistor. Spark plug comes with the patented UltrasealT coated shell to help keep the spark plug body corrosion free and better looking for a longer period of time. L79-80 B.T. (NU) Indian: 02-08 Chief/Deluxe/Springfield/Roadmaster/Vintage 2009 Chief Classic (Brembo calipers) 2009 Chief Standard (Brembo calipers) 2009 Chief Roadmaster (Brembo calipers)