Ford Aerostar Dome Light Bulb Size

Additional Notes

• The Ford Aerostar dome light specifications span the 1986-1997 model years, with two distinct bulb types appearing across that range: the 211-2 and the 912.
• The 211-2 is a festoon-type bulb with a 41mm length and an SV8.5 base, operating at 12 volts and 12 watts under the ANSI standard applicable in the US and Canada.
• A festoon bulb is a cylindrical lamp that mounts by pressing its end caps into spring clips rather than inserting into a socket, a form factor common in interior dome and map light applications.
• The 912 is a wedge-type bulb in the T15 form factor, also rated at 12 volts and 12 watts, and is noted as a variant of the 921 under the same ANSI standard.
• The 211-2 is the more frequently specified bulb across the Ford Aerostar dome light fitment, appearing in nine of the twelve model years listed.
• The 912 appears in 1988, 1992, and 1996, making it a non-consecutive fitment that does not follow a predictable interval within the production run.
• Although the 211-2 and 912 share identical voltage and wattage ratings, their base types differ entirely, as the SV8.5 festoon base and the T15 wedge base are physically incompatible with each other.
• Because the 912 is a variant of the 921, the two bulbs share a closely related design, though they are not always interchangeable depending on socket tolerances in a given application.
• The alternating use of two physically distinct bulb types across the Aerostar's production years means that year-specific verification is necessary before a dome light bulb replacement is selected.