Chevrolet Classic front side marker bulbs measure 24 in size while rear side marker bulbs measure 194 in size. The replacement chart covers 2004 to 2005 vehicle production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Chevrolet Classic uses two distinct bulb types across its front and rear side marker positions for the 2004-2005 model years: the type 24 at the front and the type 194 at the rear.
The type 24 bulb is an ANSI-standardized single-filament bulb rated at 12V and 2W, fitted with a BA9s base, which is a small bayonet-style cap common in low-wattage indicator applications.
The type 194 bulb is an ANSI-standardized miniature wedge bulb of the T10 form factor, rated at 12V and 3.78W, and relies on its wedge-shaped base rather than a locking mechanism for retention.
The rear side marker position draws slightly more power than the front, as the type 194 operates at 3.78W compared to the 2W rating of the type 24 used at the front.
The BA9s base of the type 24 and the wedge base of the type 194 are physically incompatible with each other, meaning the two bulb types are not interchangeable between front and rear positions.
Both bulb types carry ANSI standardization applicable in both the United States and Canada, indicating conformance to a shared North American specification for these components.