Ford Mustang Dome Light Bulb Size

Additional Notes

• The 12961 is a Philips 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. The Ford Mustang uses this bulb for the dome light across the 2015-2023 model years, and it is also specified for the front dome light on the 2021-2023 models.
• The 906 is the most frequently recurring bulb type across the older model year entries in these specifications. It is an ANSI-standard T10 miniature wedge bulb rated at 12V and 8W, appearing across multiple non-consecutive model years between 1980 and 1998.
• The T10 wedge base is shared by three distinct bulbs in these specifications: the 12961 (5W), the 906 (8W), and the 168 (4.9W). Despite sharing the same base type, these bulbs carry different wattage ratings and are not interchangeable without accounting for those differences.
• Festoon bulbs appear in several entries and come in varying lengths. The 578 and 212-2 are both 41mm festoon types, while the 561 and 562 are 44mm. The 212-2 uses an SV8.5 base, whereas the 578, 561, and 562 use end-cap contacts, making the 212-2 physically distinct despite its similar length to the 578.
• The 912 is a T15 wedge bulb rated at 12V and 12W, specified for the 1987 and 1989 Ford Mustang dome light. It is described as a variant of the 921 bulb. The larger T15 form factor distinguishes it from the T10 wedge bulbs used in other model years.
• The 105 and 1003 bulbs both use a BA15s single-contact bayonet base, which is a physically different mounting type from the wedge and festoon bases found elsewhere in these specifications. The 105 is rated at 13W and is a variant of the 1156, while the 1003 is rated at a higher 21W.
• The 1003 bulb, rated at 21W, is the highest-wattage bulb in these specifications. It is listed for the Ford Mustang dome light across the 1964-1969 model years, a period when higher-wattage incandescent bulbs were more common in automotive interior lighting.
• The 1994 Ford Mustang uses the 562 festoon bulb, which at 44mm differs in length from the 41mm 578 festoon used in the 2002 model. Although both are 12V, 12W festoon types with end-cap contacts, the difference in length means they are not interchangeable.