James Gaskets Big Twin Rocker Box Assembly Washer - Screws Fibre 25/PK 63858-49 — Harley-Davidson (1984-1999)

James Gaskets big twin rocker box assembly washer for V-twin motorcycles, sold in a 25-pack. These fiber washers seal rocker box fasteners on Harley-Davidson and Indian big twin engines using OEM-grade materials and U.S. manufacturing.

Features

• 25-pack quantity
• Fiber construction for rocker box sealing
• Made in the U.S.A.
• OEM-specification washer

Specifications

• Brand: James Gaskets
• Manufacturer Part #: 63858-49
• Quantity: 25 per pack
• Length: 1.4 in
• Width: 4.05 in
• Height: 0.65 in
• Weight: 0.018 lbs

Fitment

Fits big twin V-twin motorcycles including Harley-Davidson and Indian models with rocker box assemblies.

Frequently Asked Questions

What are these washers used for?

They seal rocker box fastener holes to prevent oil leaks on big twin engines during assembly or rebuild.

Why are they sold in 25-packs?

The 25-pack quantity suits shops, multi-bike rebuilds, and riders stocking spares for future service.

Will these fit my Sportster?

No — this part is for big twin engines. Sportster models use different rocker box washers.

Are these genuine OEM?

These are James Gaskets OEM-specification replacements, not factory Harley or Indian parts, but meet or exceed OEM standards.