Two separate coils will fire the spark plugs independently and only the spark plug of the cylinder that is on compression stroke will be fired

These 3 layer gaskets are rivited together

The combination of this alloy and the forging process allows the piston to flex under detonation

Fits: > S&S Super A

Note: The 'Waxed Cotton' material

PS, Model 412 shock set. 12". Black. STD duty 1980-25 Touring 6-speed Two separate coils will fireDescription 412 series shocks: Best value Progressive Suspension shock, great as stock replacement. Nitrogen charged double steel wall body. Multi staged velocity sensitive valving. Five position cam style preload adjustment. Note: Black 412 shocks may be supplied without lower cover. What are Progressive Suspension's 'Heavy Duty' shocks? If you are a lightweight rider with a lightweight passenger, STD Duty is probably your best choice, heavy duty