The Isuzu i-370 brake light requires a 3057 bulb size for proper installation and function within the rear lighting assembly. Data for the specific component covers the 2007 to 2008 range.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Isuzu i-370 uses the 3057 bulb for its brake lights across the 2007-2008 model years.
The 3057 is a dual-filament wedge bulb classified under the T25 form factor, operating at 12V with a wattage split of 27W for the high-intensity filament and 7W for the low-intensity filament, conforming to ANSI standards in the US and Canada.
The dual-filament design of the 3057 allows it to serve both a brighter stop function and a dimmer running light function within a single bulb housing.
The center high mount stop light on the Isuzu i-370 uses the 912 bulb for the 2007-2008 model years.
The 912 is a single-filament wedge bulb classified under the T15 form factor, operating at 12V and 12W, conforming to ANSI standards in the US and Canada.
The 912 bulb is a variant of the 921, meaning the two share a physical form factor, though they differ in wattage output and are not directly interchangeable in all applications.
The T25 and T15 designations refer to the outer envelope width of each bulb, with T25 indicating a wider body than the T15, which affects housing fitment.
Because the 3057 is a dual-filament bulb and the 912 is a single-filament bulb, the two serve distinct circuit functions and are not interchangeable with each other despite both using wedge-style bases.