GMC P15 / P1500 Dome Light Bulb Size

GMC P15 / P1500 dome light bulb uses a 211-2 size. The replacement chart covers 1967 to 1968 vehicle production years with corresponding bulb size specifications.

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
1967-1968	211-2

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	211-2

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Additional Notes

The 211-2 is the sole bulb type listed for the GMC P15 / P1500 dome light, appearing across both available model years: 1967-1968.
The 211-2 follows the ANSI standard, meaning it conforms to the lighting specifications recognized across the United States and Canada.
As a festoon bulb, the 211-2 is cylindrical in shape and mounts by pressing its flat metal end caps into spring clips at each end of the socket, rather than using a twist or plug-in base.
The 211-2 has a physical length of 41mm, which is a factor in socket fitment, as festoon bulbs must match the span between the retaining clips.
The SV8.5 base designation refers to the flat, single-contact end caps on the festoon body, with 8.5 indicating the cap width in millimeters.
The 211-2 operates at 12 volts, consistent with the standard electrical system voltage of automotive applications from this era.
At 12 watts, the 211-2 draws a moderate current load relative to other festoon bulbs, which is a relevant consideration when evaluating socket and wiring compatibility.