Pontiac Sunbird Dome Light Bulb Size

Additional Notes

• The 561 is the dominant dome light bulb type across the Pontiac Sunbird's listed model years, appearing in ten of the eleven entries spanning 1976-1994.
• The 561 is a festoon-style bulb, meaning it is cylindrical in form and seats by pressing its end-cap contacts against spring clips at both ends of the socket housing rather than using a base or wedge fitting.
• The 561 bulb measures 44mm in length and operates at 12 volts with a 12-watt output, conforming to the ANSI standard recognized in both the United States and Canada.
• The 168 bulb is specified for the 1992 Pontiac Sunbird dome light and is a T10 miniature wedge type, which seats by friction through a tapered plastic wedge base inserted directly into the socket.
• The 168 operates at 12 volts and 4.9 watts, making it a significantly lower-wattage bulb than the 561, which draws 12 watts at the same voltage.
• The festoon 561 and the wedge-base 168 use physically incompatible socket types and are not interchangeable, as their mounting mechanisms differ entirely.
• Both the 561 and 168 conform to ANSI standards applicable in the United States and Canada, meaning their electrical and physical specifications are governed by a recognized North American standardization body.
• The 1992 model year stands as the sole entry in the provided specifications where the dome light socket accepts a wedge-base bulb rather than a festoon bulb.