Ford E-450 Super Duty Map Light Bulb Size

The Ford E-450 Super Duty map light utilizes bulb sizes 578 and 211-2 for the interior lighting components. Available data for the specified vehicle covers the range from 2003 through 2023.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2021-2023	578
2004-2019	578
2000-2003	211-2

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V, 12W.	578
ANSI standard (US & Canada). Festoon bulb, 41mm length, SV8.5 base. 12V, 12W.	211-2

Other Locations

Additional Notes

The Ford E-450 Super Duty map light uses one of two bulb types across its model years: the 578 for 2004-2023 and the 211-2 for 2000-2003.
Both the 578 and 211-2 are ANSI-standardized festoon bulbs rated at 12V and 12W, sharing the same 41mm length.
A festoon bulb is a cylindrical lamp that mounts horizontally between two spring-loaded contacts or end caps within a fixed-length housing.
Despite their identical voltage, wattage, and physical length, the 578 and 211-2 differ in base type: the 578 uses end-cap contacts, while the 211-2 uses an SV8.5 base, making them non-interchangeable.
The SV8.5 base on the 211-2 incorporates a distinct contact arrangement at one end of the bulb, whereas the 578 relies on metal caps at both ends to complete the circuit.
Because the two bulb types use different contact configurations, a 578 cannot serve as a direct replacement in a socket designed for the 211-2, and vice versa, even though the overall length is the same.
Both bulb types are part of the ANSI standardization system used across the United States and Canada, meaning equivalent units from different manufacturers share the same electrical and physical specifications within each type.