Buick Riviera Dome Light Bulb Size

Additional Notes

• The bulb size 561 is the most frequently specified dome light bulb across the Buick Riviera model range, covering the 1974-1983 and 1985-1988 model years, as well as 1979-1983 and earlier years back to 1974.
• The 561 and 562 are both 44mm festoon bulbs rated at 12V and 12W with end-cap contacts, making them physically and electrically similar, though they are distinct ANSI part numbers and are not guaranteed to be interchangeable.
• The Buick Riviera used the 1004 bulb for its dome light across a notably long early production span, covering the 1963-1969 model years.
• The 1004 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with a 21/5W output, and is classified as a variant of the 1157. Its dual-filament design is atypical for dome light applications, where only one filament would be in use.
• The 211-2 festoon bulb, used on the 1970, 1972, and 1973 Riviera, has a 41mm length with an SV8.5 base, which differs physically from the 44mm end-cap festoon format of the 561 and 562, making cross-substitution between these festoon types unsuitable without verification.
• The 1971 Riviera is specified with the 194 bulb, a T10 miniature wedge type rated at 12V and 3.78W, which is the lowest wattage of any bulb in this specification set.
• The 168 bulb, specified for the 1996-1999 Riviera, is also a T10 miniature wedge type rated at 12V and 4.9W, sharing the same base format as the 194 but operating at a higher wattage, meaning the two are not rated equivalents despite their physical similarity.
• The 906 bulb used in the 1995 Riviera is a T10 miniature wedge type rated at 12V and 8W, the highest wattage among the T10 wedge bulbs in this specification set, and is not a rated equivalent to the 168 used in adjacent model years despite sharing the same base type.
• Three distinct T10 wedge bulbs appear across the later model years of the Riviera: the 194, 168, and 906. All share the same wedge base format but differ in wattage, and substituting one for another would result in a mismatch with the original power rating.
• The festoon format, encompassing the 561, 562, and 211-2 bulbs, accounts for the dome light specification across the majority of the Riviera's model years, spanning from 1970 through 1993 with some variation in length and base type within that group.