Buick Regal Dome Light Bulb Size

Additional Notes

• The Buick Regal dome light specifications reference six distinct bulb sizes across the model's history: 12961, 906, 168, 562, 561, 212-2, and 211-2.
• The 12961 is a Philips-designated part number rather than an ANSI standard designation. It is a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W, and it fits the Buick Regal for the 2011-2017 model years.
• The 906 and 168 bulbs are both ANSI-standard T10 miniature wedge types sharing the same physical base style, though they differ in wattage. The 906 is rated at 8W while the 168 is rated at 4.9W, meaning the two are not interchangeable despite their shared form factor.
• The 906 bulb covers the Regal across the 1998-2004 model years, making it the most consistently applied single bulb size within the specifications.
• Festoon bulbs account for the majority of dome light fitments in the earlier Regal model years. The 561, 562, 212-2, and 211-2 are all festoon-type bulbs rated at 12V and 12W.
• The 561 and 562 are both 44mm festoon bulbs with end-cap contacts and identical electrical ratings. Despite their near-identical specifications, the Regal's fitment data treats them as distinct sizes across different model years.
• The 212-2 and 211-2 are both 41mm festoon bulbs with an SV8.5 base, rated at 12V and 12W. The SV8.5 base refers to a bayonet-style festoon fitting, which differs physically from the end-cap contact style used by the 561 and 562.
• The 41mm 212-2 and the 44mm 561/562 festoon bulbs are not interchangeable due to the difference in length and base type, even though their voltage and wattage ratings are identical.
• The 1997 Regal uses the 168 bulb, which at 4.9W is the lowest-wattage dome light bulb listed across all model years in the specifications.
• The T10 wedge base format, represented by the 12961, 906, and 168 bulbs, is the dominant fitment type for the Regal from 1997 onward, while festoon formats were exclusive to the 1973-1990 model years.