Chevrolet Astro Parking Light Bulb Size

The Chevrolet Astro parking light utilizes 3157NA and 2057 bulb sizes depending on the specific production period for the vehicle. Available data covers the range from 1985 through 2005.

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
1995-2005	3157NA
1985-1994	2057

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25), natural amber glass. 12V, 27W/7W.	3157NA
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Brighter variant of 1157. 12V, 26.9W/8W.	2057

Other Locations

Additional Notes

The Chevrolet Astro uses two distinct parking light bulb types across its production run, with the 2057 fitted to 1985-1994 models and the 3157NA fitted to 1995-2005 models.
The 3157NA is a dual-filament T25 wedge bulb rated at 12V with a high filament draw of 27W and a low filament draw of 7W, conforming to ANSI standards recognized in both the United States and Canada.
The natural amber glass of the 3157NA produces a yellow-tinted output directly from the bulb envelope, without relying on a colored lens to achieve the amber effect.
The 2057 is a dual-filament bulb using a BAY15d bayonet base, rated at 12V with filament draws of 26.9W and 8W, and is also ANSI-compliant for the US and Canadian markets.
The 2057 is a brighter variant of the 1157, sharing the same BAY15d bayonet base, which means the two types are physically interchangeable in terms of socket fit, though their output levels differ.
The 3157NA uses a wedge-style base, which is mechanically incompatible with the BAY15d bayonet socket used by the 2057, making the two bulb types non-interchangeable between the 1985-1994 and 1995-2005 fitments.
Both the 3157NA and the 2057 are dual-filament designs, a configuration that allows a single bulb to serve both a lower-intensity parking function and a higher-intensity signaling or braking function through separate filaments within the same envelope.