Oldsmobile Omega Dome Light Bulb Size

The Oldsmobile Omega dome light requires bulb size 561 or 211-2 depending on the specific vehicle configuration. Data for the lighting components covers the range from 1973 to 1984.

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
1982-1984	561
1975-1980	561
1973-1974	211-2

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	561
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	211-2

Other Locations

Additional Notes

The Oldsmobile Omega uses the 561 bulb for the dome light across the 1975-1984 model years, with the exception of 1973-1974, which use the 211-2 bulb instead.
Both the 561 and 211-2 are festoon-style bulbs, meaning they are cylindrical in shape and mount by pressing between two spring clips rather than inserting into a socket.
The 561 and 211-2 share identical electrical ratings of 12 volts and 12 watts, so they draw the same power and produce equivalent light output.
Despite matching electrically, the 561 and 211-2 are not directly interchangeable. The 561 uses end-cap contacts and measures 44mm in length, while the 211-2 uses an SV8.5 base and measures 41mm in length.
The 3mm difference in length between the two bulbs is a relevant fitment factor, as festoon bulbs must span the exact distance between their mounting clips to make proper contact and remain seated.
The SV8.5 base designation on the 211-2 refers to a specific contact configuration that differs from the flat end-cap contacts of the 561, further distinguishing the two bulbs beyond length alone.
Both bulbs conform to ANSI standards applicable in the United States and Canada, indicating they meet a defined set of dimensional and performance tolerances for those markets.