Ford Aerostar Stepwell Bulb Size

The Ford Aerostar stepwell light requires a 168 bulb size for proper installation and function within the vehicle interior. Data for the specific component covers the period from 1995 through 1997.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	US Type	EU Type	Shop
1995-1997	168	W5W	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168	Check Price
ECE standard (Europe & worldwide). Single-filament signalling bulb with W2.1x9.5d wedge base. 12V, 5W.	W5W	Check Price

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Additional Notes

The Ford Aerostar uses the 168 bulb for its stepwell across the 1995-1997 model years.
The 168 is an ANSI-standardized bulb recognized in both the United States and Canada, meaning it conforms to a defined set of electrical and physical parameters shared across manufacturers.
It belongs to the T10 miniature wedge family, a base type that relies on two angled plastic legs rather than a metal screw or bayonet fitting to secure the bulb in its socket.
The bulb operates at 12 volts and draws 4.9 watts, placing it in the low-wattage range typical of interior and courtesy lighting applications.
The wedge base format of the 168 means fitment depends on socket compatibility with the T10 wedge design, and substituting a bulb with a different base type would not be physically interchangeable even if the voltage rating matched.