This is a Transmission Mainshaft Oil Seal for Vintage Harley Davidson Big Twins (4-Speed)
- Double lip
- Blue sealing compound on the outside edge for better seal on the transmission case
- Single shielded
- 4 speed transmission
- Compatible with 1936-1979 4-speed Big Twins (Flathead, Knucklehead, Panhead, Shovelhead)
- New part, but has been in storage for numerous years





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