Freightliner 108SD Side Marker Bulb Size

The Freightliner 108SD front side marker bulb uses a 3457NA size bulb for this commercial truck model. The replacement chart covers vehicle production spanning 2012 to 2017.

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

Front Side Marker

Years	Bulb Size
2012-2017	3457NA

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Dual-filament wedge bulb (T25), natural amber glass. 12V, 27W/7W.	3457NA

Other Locations

Additional Notes

The Freightliner 108SD uses the 3457NA bulb for the front side marker position across the 2012-2017 model years.
The 3457NA is an ANSI-standardized bulb type, meaning its physical and electrical specifications conform to a recognized North American industry standard shared across the US and Canada.
The bulb carries a dual-filament design, operating at 27 watts on the high filament and 7 watts on the low filament, which allows it to serve two distinct lighting functions within a single housing.
Its T25 wedge form factor refers to a tubular glass envelope with a wedge-style base, which seats directly into a socket without a separate metal base or locking pins.
The natural amber glass designation means the color is produced by the glass envelope itself rather than by a coating or lens filter, which generally results in more consistent color output over the bulb's service life.
The 3457NA operates on a 12-volt electrical system, consistent with standard commercial vehicle electrical architecture.
Because the 3457NA is dual-filament, substituting it with a single-filament bulb of similar wattage would result in the loss of one lighting function at that position, making filament count a critical factor in replacement selection.