Avanti II Dome Light Bulb Size

The Avanti II dome light requires a 1004 bulb size for proper illumination within the interior cabin area of the vehicle. Data for the specified component covers the range from 1965 through 1973.

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
1965-1973	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 Avanti II uses the 1004 bulb for its dome light across all listed model years, spanning 1965-1973.
The 1004 is an ANSI-standardized bulb type, meaning its specifications are defined by a recognized North American standards body and are consistent across manufacturers in the US and Canada.
The 1004 operates on a 12-volt electrical system, which aligns with the standard automotive electrical architecture of the era.
The 1004 is a dual-filament bulb, meaning it contains two separate filaments within a single envelope, each rated at a different wattage: 21 watts and 5 watts respectively.
The 1004 uses a BAY15d bayonet base, a two-pin offset base type where the two pins are positioned at different heights to ensure correct orientation during installation.
The 1004 is a variant of the 1157 bulb. While the two share the same BAY15d base and dual-filament design, they differ in their electrical ratings, and the two types are not directly interchangeable despite their physical similarities.