Chevrolet Classic Courtesy Bulb Size

The Chevrolet Classic courtesy light requires a 168 bulb size for proper installation and function within the interior lighting system. Data for 2004 through 2005 provides the specific information regarding the necessary components for the vehicle.

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
2004-2005	168

Bulb Specifications

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

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Additional Notes

The T10 miniature wedge is the bulb type specified for the courtesy function of the Chevrolet Classic across the 2004-2005 model years.
The T10 form factor uses a wedge-style base, meaning the glass envelope itself acts as the retention mechanism rather than a separate metal base or pins.
The 168 designation follows the ANSI standardization system, which applies to both the United States and Canada, indicating a consistent part number across North American markets.
The 168 bulb operates at 12 volts, which is consistent with the standard electrical system voltage found in passenger vehicles.
At 4.9 watts, the 168 bulb draws a low level of current, a characteristic typical of interior courtesy lighting applications where extended illumination without significant battery drain is expected.
The T10 designation refers to the bulb's tubular envelope, with the numeric portion indicating a width of 10 eighths of an inch, a sizing convention used in the ANSI miniature bulb classification system.
Because the 168 is an ANSI-standardized type, it is physically interchangeable with other bulbs sharing the T10 wedge base, though substitutions with different wattage ratings may affect circuit compatibility.