37531-56B 1956 from serial number 56KH-1465 to 66 all, 1967 to 1969 XLCH
12021 1967-1970 XLH, 1970 XLCH
The clutch gear seal keeps oil out of the dry clutch.
It is used from 1956 serial number 56KH-1465. The 1967 dry clutch electric start clutch gear takes a bigger seal. Wet clutch Iron Sportsters do not use any seal.
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37531-56B on left, near the early model dry-clutch gear with the extentison pressed in. The 12021 is on the right. It is bigger and goes direclty in the electric start dry clutch gear above it.
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