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

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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: 270307451

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Details

Brand
Dorman
Colour
Black
Material
Rubber
Exterior finish
Machined
Item dimensions L x W x H
10.4 x 10.4 x

⛽Precision OEM fit

🛠️Durable, long-lasting build

🇺🇸Trusted US expertise

Description

⛽ Seal the deal with confidence — fuel your ride flawlessly!

BUILT TO ENDURE - Crafted from premium materials for reliable, long-term durability
EXPERT BACKED QUALITY - Developed by seasoned US automotive pros with 100+ years of combined experience
RESTORES PEAK PERFORMANCE - Revives your fuel system’s integrity by replacing worn-out seals
SEAMLESS OEM COMPATIBILITY - Direct replacement engineered to match original Ford/Lincoln/Mercury specs perfectly
FIT GUARANTEE WITH GARAGE TOOL - Easily confirm exact fit by entering your vehicle’s make, model, and trim

The Dorman577-501 Fuel Filler Neck Seal is a precision-engineered, direct replacement part designed to restore the original fuel system seal on select Ford, Lincoln, and Mercury vehicles. Made from durable materials and backed by over a century of US automotive expertise, it ensures a perfect fit and long-lasting performance, helping maintain your vehicle’s fuel system integrity.

Specifications

Manufacturer	Dorman Products
Brand	Dorman
Model	Dorman 577-501: Fuel Filler Neck Grommet
Product Dimensions	10.41 x 10.41 x 7.62 cm; 45.36 g
Item model number	577-501
Exterior	Machined
Manufacturer Part Number	577-501
OEM Part Number	FNA05; 2R3Z9072AA; F8AC 9072-AB; F8AC 9072-AC; F8AZ 9072-AB
Item Weight	45.4 g