Buick Skyhawk Dome Light Bulb Size

Additional Notes

• The Buick Skyhawk dome light specifications span model years 1975 through 1989, covering three distinct bulb types across that range.
• The 561 is the most frequently specified dome light bulb for the Buick Skyhawk, appearing across model years 1975-1980 and 1982-1987.
• The 561 is an ANSI-standard festoon bulb rated at 12V and 12W, with a 44mm length and end-cap contacts that make direct metal-to-metal contact at both ends of the bulb rather than through a base socket.
• The 211-2 is specified for the 1989 Buick Skyhawk and is also a festoon bulb rated at 12V and 12W, though it measures 41mm in length and uses an SV8.5 base rather than end-cap contacts.
• Although the 561 and 211-2 share the same voltage and wattage ratings, their differing lengths and base types make them physically non-interchangeable without modification to the fixture.
• The 906 is specified for the 1988 Buick Skyhawk and differs from both festoon types in its physical form, as it is a miniature wedge bulb in the T10 form factor rated at 12V and 8W.
• The 906 wedge bulb draws 8W, which is 4W less than either festoon type specified for other model years, reflecting a difference in luminous output between the 1988 model year and surrounding years.
• All three bulb types carry ANSI standard designations valid in both the United States and Canada, indicating standardized electrical and physical tolerances across manufacturers.
• The shift from the 561 festoon in 1987 to the 906 wedge in 1988 and then to the 211-2 festoon in 1989 represents three consecutive model years each using a different bulb type, none of which are directly interchangeable with one another.