Chevrolet Celebrity Trunk Bulb Size

The Chevrolet Celebrity trunk light utilizes bulb sizes 561 and 1003 for illumination within the rear storage compartment. Data for the specific lighting components covers the period from 1982 through 1990.

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 Type	Shop
1990	561	Check Price
1987-1988	1003	Check Price
1986	561	Check Price
1985	1003	Check Price
1984	561	Check Price
1982-1983	1003	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	561	Check Price
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.	1003	Check Price

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Additional Notes

The Chevrolet Celebrity trunk light specifications reference two distinct bulb types across its production run: the 561 festoon and the 1003 single-filament bayonet.
The 561 is a festoon-style bulb rated at 12V and 12W, measuring 44mm in length with end-cap contacts at each end that press against spring-loaded holders rather than inserting into a socket base.
The 1003 operates at 12V and 21W, drawing notably more power than the 561, and uses a BA15s bayonet base, which is a single-contact base requiring a quarter-turn to lock into its socket.
Both bulb types conform to ANSI standards recognized in the United States and Canada.
The 561 festoon and the 1003 bayonet use physically incompatible mounting systems, meaning one cannot substitute for the other regardless of voltage compatibility.
The Chevrolet Celebrity (1982-1983 and 1985, 1987-1988) used the 1003 bulb in the trunk, while the 1984, 1986, and 1990 model years used the 561.
Because the specified bulb type alternates across model years rather than following a single continuous pattern, confirming the exact model year is necessary before selecting a replacement trunk bulb.