GMC K2500 Suburban Courtesy Bulb Size

The GMC K2500 Suburban courtesy bulb utilizes 3 distinct sizes: 561, 74, and 1003 bulb configurations. The replacement chart documents vehicle production data spanning from 1979 through 1999.

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

If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.

YearsUS TypeEU TypeShop
1999561561Check Price
199874W1.2WCheck Price
199710031003Check Price
1996194W5WCheck Price
1994-1995168W5WCheck Price
1993194W5WCheck Price
1992168W5WCheck Price
1985-1986168W5WCheck Price
198410041004Check Price
198310031003Check Price
1979-19801156P21WCheck Price

Bulb Specifications

Description Type Shop
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.561Check Price
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 1.4W.74Check Price
ECE standard (Europe & worldwide). Miniature wedge bulb (T5) with W2x4.6d base. 12V, 1.2W.W1.2WCheck Price
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.1003Check Price
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 3.78W.194Check Price
ECE standard (Europe & worldwide). Single-filament signalling bulb with W2.1x9.5d wedge base. 12V, 5W.W5WCheck Price
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 4.9W.168Check Price
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.1004Check Price
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. 12V, 21W.1156Check Price
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.P21WCheck Price

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