Oldsmobile Cutlass Calais Dome Light Bulb Size

Additional Notes

• The Oldsmobile Cutlass Calais dome light specifications span model years 1978-1991, with five distinct bulb types used across that period: 561, 562, 906, 212-2, and 211-2.
• The 561 bulb is the most frequently specified type across the Cutlass Calais dome light fitments, appearing in the 1980, 1982, 1984, 1990, and 1991 model years.
• The 561 is a festoon-style bulb with end-cap contacts, a 44mm length, and a 12V, 12W rating, conforming to ANSI standards for the US and Canadian markets.
• The 562 bulb, specified for the 1983 model year, shares the same festoon construction, 44mm length, end-cap contact design, and 12V, 12W rating as the 561, making the two physically and electrically similar.
• Despite their similarities, the 561 and 562 carry separate ANSI designations, and substituting one for the other without confirming socket compatibility is not advised.
• The 906 bulb, used in the 1988-1989 model years, differs fundamentally from the festoon types. It is a miniature wedge bulb in the T10 form factor, operating at 12V and 8W, and uses a wedge base rather than end-cap contacts.
• The lower wattage of the 906 (8W) compared to the festoon types (12W) reflects the different electrical draw associated with the wedge bulb format used in those two model years.
• The 212-2 bulb, specified for the 1978 and 1981 model years, is a festoon bulb with a 41mm length and an SV8.5 base, rated at 12V and 12W.
• The 211-2 bulb, specified for the 1979 model year, shares the same 41mm length, SV8.5 base, and 12V, 12W rating as the 212-2, though the two carry distinct ANSI designations.
• The SV8.5 base on the 211-2 and 212-2 bulbs is a specific festoon base type that is not interchangeable with the end-cap contact design of the 561 and 562, despite all four sharing the same wattage rating.