The Freightliner 108SD headlight bulb uses 9003 or 9008 size bulbs for both high beam and low beam applications. A replacement chart covering 2012-2017 model years documents the bulb size specifications for this vehicle.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Freightliner 108SD uses two distinct bulb types across its headlight specifications: the 9003 and the 9008, each serving both high beam and low beam functions depending on the model year.
The 9003 bulb is a dual-filament halogen type that operates both high and low beam functions within a single unit, which explains its use in both headlight positions for the 2014-2017 model years.
The 9008 bulb, also known as H13, is likewise a dual-filament halogen bulb capable of handling both beam modes, and it appears in both the high beam and low beam positions for the 2012-2013 model years.
Although the 9003 and 9008 are both dual-filament halogen bulbs with similar functional roles, they are not interchangeable due to differences in their base configurations and connector designs.
The low beam and high beam positions share the same bulb size for every model year listed, indicating that the 108SD headlight housing uses a single bulb per side to handle both beam functions rather than separate dedicated bulbs.
The 9003 bulb operates at 60 watts on high beam and 55 watts on low beam, while the 9008 operates at 65 watts on high beam and 45 watts on low beam, resulting in different light output profiles between the two generation types.
A bulb change from 9008 to 9003 or vice versa would require attention to connector compatibility, as the two bulb types use physically different locking tab and socket arrangements that prevent direct substitution without modification.