Corrosion Resistant Switch with heavy duty contacts and brass flag mount terminals. You can use screws or the flag-mount terminals with this switch. Male Threaded 1/8" NPT (For best results, we recommend using thread sealing tape.) Fits 1958-1970 Harley FL/FX Big Twin, 1951-1973 45ci Servi-Car, 1971-Later FL/FX Big Twin (Except 1973-1977 FX), 2002-2006 V-Rod VRSC & 1979-2021 Sportster XL. Replaces HD# 72023-51C