With each cam change S&S recommends their 583903 Precision tappet assembly set

Street Glides & Trikes)

clutch hub and clutch pressure plate

54-74 XL 13-1/2" C/C

Fits: > S&S Super A

PS, Model 412 shock set. 12". Black. STD duty 1980-25 Touring 6-speed With each cam change S&SDescription 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