Transmission mainshaft lock nut.
FITMENT
1936 / 1940 EL 1937 / 1948 UL 1941 / 1984 FL 1971 / 1984 FX 1984 / 1990 FXST 1986 / 1990 FLST 1984 / 1990 FLT 1984 / 1990 FXR ACCESSORY ITEMS
12-051517-020412-048117-0693
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