✓ VERIFIED
Jan 16, 2020
Almost identical to OEM. Good fit. I did miss that they are sold as each and not as a pair. Small detail and my fault but it did slow my project down a bit.
COMETIC
SKU: 68-10306F5
Cometic Primary Housing Gasket - M8 Molded Rubber Clutch Seal ALL FXS Oe#257010… — Harley-Davidson (2018-2021)
$38.52
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Cometic primary housing gasket for Milwaukee-Eight (M8) engines, a molded rubber clutch seal that replaces OEM part #257010. Direct-fit replacement for FXS models and other M8 applications requiring a factory-spec primary cover seal.
Features
- Molded rubber construction
- OEM-spec replacement for M8 engines
- Direct fit to primary housing
Specifications
- Brand: Cometic
- Manufacturer Part #: C10306F5
- Length: 7 in
- Width: 6 in
- Height: 0.05 in
- Weight: 1 lbs
Fitment
Fits Harley-Davidson FXS models and other V-twin motorcycles with Milwaukee-Eight (M8) engines that use OEM primary housing part #257010.
Frequently Asked Questions
Will this fit my Twin Cam engine?
No — this gasket is specific to Milwaukee-Eight (M8) engines. Twin Cam models require a different part number.
Is this the OEM Harley gasket?
This is a Cometic-manufactured replacement built to OEM specification for part #257010. It meets factory fitment and sealing standards.
Do I need any special tools to install this?
Standard gasket replacement tools are sufficient. Remove the primary cover, clean the sealing surface, and install the new gasket with appropriate torque specs for your model.
| BRAND | Cometic |
| TYPE | Gaskets/Seals |
| SKU | 68-10306F5 |
| WEIGHT | 1.0 lb |
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
CUSTOMER REVIEWS
4.87
15 RATINGS
5★
13
4★
2
3★
0
2★
0
1★
0
✓ VERIFIED
Oct 18, 2021
Great seals and gaskets do the job once when you use quality gaskets
✓ VERIFIED
Sep 26, 2019
Seal good and I haven't had any issues..
✓ VERIFIED
Jun 27, 2025
It worked like it was suppose to, delivery was quick. <br />Pleased.
✓ VERIFIED
Dec 19, 2023
Just what I needed
Needed these when changing out intake manifold. They worked perfect for my ‘03 sporty.
✓ VERIFIED
Jun 12, 2023
Cometic from here on out
These seals are the only ones I'll use. others came close but, for me, these are best.
