The Ford E-350 Super Duty brake light uses 3157, 3357, and 2458 bulb sizes depending on the specific production period for the vehicle. Available data covers a span of time starting from 1999 through 2023.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ford E-350 Super Duty brake lights use two distinct bulb types across the model years covered in these specifications: the 3157 and the 3357. Both are ANSI-standard wedge bulbs rated at 12 volts and share the same T25 form factor, yet they differ in a fundamental way. The 3157 is a dual-filament bulb rated at 27W/7W, while the 3357 is a single-filament bulb rated at 27W only.
Because the 3157 and 3357 share the same T25 wedge base and physical housing, they can appear interchangeable at a glance. However, substituting a single-filament 3357 for a dual-filament 3157 would result in the loss of one lighting function, since the second filament in the 3157 typically serves a separate circuit such as a running light or turn signal in addition to the brake light.
The Ford E-350 Super Duty uses the 3157 for brake lights across the 1999-2003 model years, then transitions to the 3357 for 2004-2009, and returns to the 3157 for 2010-2023, with no year in the covered range using both types simultaneously for the same position.
The shift from the 3157 to the 3357 between the 2003 and 2004 model years, and the subsequent return to the 3157 between 2009 and 2010, represents a change in the brake light circuit design for those respective periods. The single-filament 3357 used in 2004-2009 suggests the brake light function was handled independently from any combined running light circuit during those years.
The center high mount stop light (CHMSL) on the Ford E-350 Super Duty uses the 912 bulb across all model years listed in the specifications, from 1999 through 2019. This bulb is an ANSI-standard T15 wedge type rated at 12V and 12W.
The 912 bulb is described as a variant of the 921. Both share the T15 wedge base, but they differ in wattage. The 921 is rated at 16.8W, making it a higher-output alternative. This distinction is relevant when sourcing replacements, as the two are not identical despite their physical similarity.
The CHMSL circuit on the E-350 Super Duty uses a single-filament 912 bulb, which is consistent with the dedicated, single-function nature of a center high mount stop light. This position is required by federal safety standards in the United States and serves only as a brake indicator.
The 3157 is the most frequently specified bulb across the full range of brake light data in these specifications, appearing in 18 of the 24 model years listed for that position. The 3357 accounts for the remaining 6 years, covering 2004-2009.
All three bulb types in these specifications, the 3157, 3357, and 912, conform to ANSI standards applicable in both the United States and Canada, indicating consistent regional fitment across the North American market.
The T15 form factor of the 912 is physically smaller than the T25 form factor shared by the 3157 and 3357. These two groups are not interchangeable with each other, as the socket sizes and housing configurations differ between the brake light positions and the CHMSL position on the vehicle.