Chevrolet Del Ray Radio Display Bulb Size

The Chevrolet Del Ray radio display utilizes bulb size 1891 or 57 depending on the specific application required for the internal lighting component. Data for the bulb sizes covers the range from 1957 to 1958.

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
1958	1891
1957	57

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 2W.	1891
ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 1W.	57

Other Locations

Additional Notes

The 1958 Chevrolet Del Ray uses a 1891 bulb for the radio display, while the 1957 model uses a 57 bulb. These are two distinct bulb types with different bases and are not interchangeable with each other.
The 1891 bulb follows the ANSI standard recognized in the US and Canada. It is a T5 miniature wedge bulb, meaning it uses a wedge-shaped plastic base rather than a metal pin or bayonet fitting. It operates at 12V and draws 2W.
The 57 bulb also follows the ANSI standard recognized in the US and Canada. It is a single-filament bulb fitted with a BA9s base, which is a small bayonet-style cap with a 9mm collar. It operates at 12V and draws 1W.
The T5 wedge base of the 1891 and the BA9s bayonet base of the 57 represent physically incompatible mounting systems. A socket designed for one will not accept the other, making cross-year substitution between the 1957 and 1958 Del Ray radio display bulbs impractical without socket modification.
The 1891 bulb draws 2W, while the 57 bulb draws 1W. This difference in power consumption reflects a distinction in brightness output, with the higher-wattage 1891 producing more light under the same 12V supply voltage.