Plymouth Plaza Dome Light Bulb Size

The Plymouth Plaza dome light requires a 1004 bulb size for proper illumination within the interior cabin area. Data for the specified lighting component covers the 1956 to 1958 range.

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
1956-1958	1004

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.	1004

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Additional Notes

The Plymouth Plaza uses the 1004 bulb for its dome light across the 1956-1958 model years.
The 1004 is an ANSI-standardized bulb type recognized in both the United States and Canada.
It is a dual-filament bulb, meaning it contains two separate filaments within a single envelope, each operating at a different wattage.
The 1004 operates at 12 volts with a power rating of 21/5 watts, corresponding to its high and low filaments respectively.
It uses a BAY15d bayonet base, which is an offset twin-pin base designed to prevent incorrect insertion by positioning its two pins at different heights.
The 1004 is a variant of the more widely known 1157 bulb type, sharing the same base configuration and dual-filament design while differing in its specific electrical output.