S&S now offers the same high quality Autolite spark plugs that we include with our engines for replacement in S&S and stock engines alike. These long reach resistor spark plugs are a replacement 12mm spark plug. They are the correct heat range for all S&S engines and also fit 1977 and later Harley-Davidson engines. Compatible with any ignition system. S&S Part #: 55-1320

Cross-Reference: The following OEM numbers are provided for reference only and may not be completely accurate.
Harley OEM Cross Reference Numbers:
32317-86A
32362-04