Geo Storm License Plate Bulb Size

The Geo Storm license plate light requires a 168 bulb size for proper installation and function. Data for 168 bulb sizes covers the range from 1990 to 1993.

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	Bulb Size
1990-1993	168

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.	168

Other Locations

Additional Notes

The Geo Storm uses the 168 bulb size for the license plate position across the 1990-1993 model years.
The 168 bulb is an ANSI-standardized type, meaning its specifications are governed by a recognized North American standard applicable in both the United States and Canada.
It belongs to the T10 miniature wedge family, a form factor that uses a wedge-shaped base rather than a metal screw or bayonet fitting, allowing the bulb to be held in place by tension within the socket.
The 168 operates at 12 volts, which is consistent with the standard electrical system voltage found in conventional passenger vehicles.
Its rated wattage of 4.9W places it in the low-power range, typical for illumination functions that require visibility rather than high output, such as license plate lighting.
The wedge base design of the T10 type means fitment depends on socket compatibility with that specific base style, and substitution with bulbs using different base types would not be physically interchangeable.