Cannonball Electric Starter Systems
In the SSK series (K for Kickstart drive) the starter motor engages in the bikes original Kick Start system. Available for models with Rigid frame (SSK-R, R for Rigid) and Swingarm frames (SSK-S, S for Swingarm)
In the SSC series (C for clutch drive) the starter motor engages in a clutch hub starter sprocket. Available for Big Twin models 1937-54 (SSC-E, E for Early) and 1955-57 (SSC-L, L for Late).
You will find a detailed starter system comparison chart linked directly to the individual articles.