Cast iron offers maximum durability and wear resistance

Cast crankcase gear cover

RCM (RUBBER COVERED METAL)

gasket & wrench

PS, 412 series shock set. 12". STD Duty. Black Dyna 91-17 Sadlar Cast iron offers maximum durabilityDescription 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