Clutch hub
The clutch hub attaches to the transmission input shaft. There were four types, one for the 1952 and 1953 5-plate clutch. The next was for the 7/8 plate dry clutch used from 1954 to 1970 XLCH. THe 1967 to 1970 electric start model got a different hub to work with the dual-row Torrington bearing in the shell (basket). Finally there was the wet-clutch hub used from 1971 onwards.
37556-52Used on the 1952 and 1953 K-models. 37556-54Used on 54 tp E57 SPortsters 37556-57A
Used on Late 1957 to 66 all, 67-69 XLCH 37557-67Used on 1967 to 70 XLH, 70 XLCH 37561-71Use on teh wet clutch bikes since 1971
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