can I use it on a 1994?

No it doesn't fit the 1994 mustang according to Amazons vehicle check. Supposedly this one fits the 1994 - Spectra Premium FNA03 Fuel Tank Filler Neck Grommet

go here to dormans site they have the correct dimensions on it. These parts are year and car specific. https://www.dormanproducts.com/p-49902-577-501.aspx

Hi. can I use it with a Mustang 1998?

Im pretty sure you can I put it on a 1999

Deliver to Tunisia

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Dorman 577-501 Fuel Filler Neck Seal Compatible with Select Ford / Lincoln / Mercury Models

Dorman 577-501 Fuel Filler Neck Seal Compatible with Select Ford / Lincoln / Mercury Models

Product ID: 14254847

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Details

Brand
Dorman
Color
Black
Material
Rubber
Exterior Finish
Machined
Item dimensions L x W x H
4.1 x 4.1 x 3

📏Precise 4.1x4.1x3 inch size

🔧Direct OEM fit

🛡️Durable rubber build

Description

🛠️ Upgrade your ride’s fuel system with precision and durability—don’t let a worn seal slow you down!

BUILT TO LAST - Crafted from premium rubber with a machined finish to withstand wear and tear over years of use.
TRUSTED LEGACY - Backed by Dorman’s century-plus expertise and USA-based product specialists ensuring quality you can rely on.
TAILORED FIT GUARANTEE - Use our garage tool to confirm exact compatibility with your vehicle’s make, model, and trim—no guesswork.
SEAMLESS OEM REPLACEMENT - Engineered to perfectly match original Ford, Lincoln & Mercury seals for hassle-free installation.
RESTORE FUEL SYSTEM INTEGRITY - Eliminates leaks and maintains optimal fuel system performance, protecting your engine and environment.

The Dorman 577-501 Fuel Filler Neck Seal is a direct-fit replacement part designed for select Ford, Lincoln, and Mercury models from 1998 to 2006. Made from durable rubber with a machined finish, it restores the original seal’s function to prevent fuel leaks and maintain system integrity. Backed by over 100 years of automotive expertise, this seal ensures reliable performance and a perfect fit confirmed via an easy-to-use vehicle compatibility tool.

Specifications

Brand	Dorman
Color	Black
Material	Rubber
Exterior Finish	Machined
Item dimensions L x W x H	4.1 x 4.1 x 3 inches
Vehicle Service Type	Car
Style	Modern
Item Weight	1.6 ounces
Closure Type	Twist-On
OEM Part Number	FNA05; 2R3Z9072AA; F8AC 9072-AB; F8AC 9072-AC; F8AZ 9072-AB
Manufacturer	Dorman Products
UPC	019495272267
Global Trade Identification Number	00019495272267
Model	Dorman 577-501: Fuel Filler Neck Grommet
Product Dimensions	4.1 x 4.1 x 3 inches
Item model number	577-501
Is Discontinued By Manufacturer	No
Manufacturer Part Number	577-501