3115-12 Seat Post Spring Plunger Assembly. 1912-1924 Harley J JD F Made in USA.

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Harley JD Seat Post Assembly.

Fits 1912 - 1924 Harley J, JD, F Models.  Singles and Twins.

This is a Complete Assembly.

Nickel Plated.

Perfect Replica. Made in the USA.

**These will fit 25' - 28' with modification.  It sounds like the frame on the 1925-1928's has a smaller ID. 

Made in the USA with USA Steel by Competition Distributing.