✓ VERIFIED
May 16, 2026
not what I needed. description wasn't very clear but not worth sending back. oh well just have to be more careful next time
COMETIC
SKU: 68-9866
Cometic Evo Big Twin Rocker Box Gasket - Base Gasket EVO 10/PK — Harley-Davidson (1984-1999)
$102.15
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Cometic rocker box base gasket for Evo Big Twin engines, engineered with advanced gasket materials to seal reliably under high performance conditions. Ten-pack quantity for shops, fleets, or riders maintaining multiple bikes.
Features
- 10-pack quantity
- Direct rocker box base gasket replacement
- Evo Big Twin engine application
Specifications
- Brand: Cometic
- Manufacturer Part #: C9866
- Weight: 0.63 lbs
- Quantity: 10 per pack
Fitment
Fits Evo Big Twin rocker box assemblies on Harley-Davidson and Indian Motorcycle V-twin engines.
Frequently Asked Questions
How many gaskets are in this pack?
Ten gaskets per pack — ideal for shops or riders servicing multiple bikes.
Will this fit my Sportster or Twin Cam?
No — this is specific to Evo Big Twin rocker boxes. Sportster and Twin Cam engines require different gasket part numbers.
Is this a direct OEM replacement?
Yes. Cometic manufactures this gasket to fit stock Evo Big Twin rocker box applications without modification.
| BRAND | Cometic |
| TYPE | Gaskets/Seals |
| SKU | 68-9866 |
| WEIGHT | 0.63 lb |
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
CUSTOMER REVIEWS
4.36
14 RATINGS
5★
11
4★
0
3★
1
2★
1
1★
1
✓ VERIFIED
Mar 8, 2026
Gasket
Working fine was for my brother's bike
✓ VERIFIED
Oct 25, 2024
Works Fine at a lower cost
I usually have an OEM from Harley Davidson, I have used this twice on my 04 Electraglide, no leaks or issues. At a much lower price.
✓ VERIFIED
Jun 8, 2024
A mediocre gasket
I didn’t use this gasket after removing the derby and seeing the Harley gasket that I removed. No comparison in quality. I ended up going to the local dealer and bought an O.E. gasket.
✓ VERIFIED
Jun 6, 2023
A good buy
The gasket fit nicely and no leaks so far . The fitment was spot on .
✓ VERIFIED
May 4, 2023
There is nothing on them indicating they are actually Cometic gaskets. Are they Substitutes?
