James Gasket Fork Seal Rebuild Kit – 39mm – Complete Set – Made in USA – Replaces 45378‑87

OVERVIEW

This James Gasket fork seal rebuild kit provides a complete, direct-replacement solution for maintaining 39mm front forks on Harley-Davidson motorcycles. Built specifically for the Dyna lineup, the assembly delivers reliable suspension operation through high-quality American construction that restores proper sealing after routine service intervals.

ENGINEERING & PERFORMANCE

These rebuild kits prevent internal fluid leakage and preserve consistent damping characteristics across extended riding conditions. Constructed with high-quality materials, they resist heat degradation while maintaining precise fork ride height and steering stability. The direct-fit geometry matches factory tolerances exactly, ensuring immediate restoration of standard suspension response during mechanical service.

KEY FEATURES

• Genuine James Gasket brand construction
• Complete kit to rebuild both 39mm fork tubes
• Includes all necessary seals, washers, O-rings, and retaining rings
• Provides drain screws with matching hardware from the factory
• Acts as a direct replacement for OEM part number 45378‑87
• Premium U.S.A. manufacturing origin ensures consistent quality

TECHNICAL SPECIFICATIONS

• Brand: James Gasket
• Part Name: Fork Seal Rebuild Kit
• Fork Diameter: 39mm
• Replaces OEM Number: 45378‑87
• Supported Years: 1987–2005 and 1988–Present
• Compatible Model Families: Dyna, FXR, FXDB, FXLR, Sportster

FITMENT

• Harley FXR / Dyna (1987–2005)
• Harley Sportster (1988–Present, excluding 1996–2003)

WHY HARLEY RIDERS CHOOSE THIS

Riders select this rebuild kit because it supplies every single component required for a thorough dual-fork service without forcing multiple vendor purchases. The American-manufactured construction prioritizes seal integrity and dimensional accuracy, which directly prevents premature fluid leaks and maintains stable front-end handling. By matching the original chassis specifications exactly, this kit allows mechanics to restore factory-level suspension travel and steering confidence across the Dyna platform.