
SEALIGHT H10/9145/9140 LED Fog Light Bulbs, 6000K Xenon W...
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Used for: Fog Light Bulb Front
Used for: Headlight Bulb High Beam
Used for: Headlight Bulb Low Beam
Used for: Back Up Reverse Light Bulb
Used for: Brake Light Bulb, Tail Light Bulb
Used for: Center High Mount Stop Light Bulb
Used for: Daytime Running Light Bulb
Used for: License Plate Light Bulb, Courtesy Light Bulb(Compare to original - Option 1), Glove Box Light Bulb
Used for: Parking Light Bulb, Turn Signal Light Bulb Front, Turn Signal Light Bulb Rear
Used for: Side Marker Light Bulb Front, Side Marker Light Bulb Rear
Used for: Ash Tray Light Bulb
Used for: Courtesy Light Bulb(Compare to original - Option 2)
Used for: Dome Light Bulb(Compare to original - Option 1), Map Light Bulb(Compare to original - Option 2)
Used for: Dome Light Bulb(Compare to original - Option 2)
Used for: Engine Compartment Light Bulb
Used for: Map Light Bulb(Compare to original - Option 1)
Used for: Trunk or Cargo Area Light
This 2003 GMC Sierra 1500 bulb size guide helps you verify the correct replacement bulbs by lighting position, so you can match the right part before you buy. Whether you are replacing a headlight, tail light, map light, or license plate bulb, this page organizes the common bulb sizes used on the truck in a simple way.
Because trim level, body style, and lighting package can vary by market, it is always smart to confirm the bulb at the vehicle before installation. Use this page as a reference for the 2003 GMC Sierra 1500, then compare the listed bulb position with your original bulb to avoid ordering the wrong size.
For the best fitment results, check whether your Sierra 1500 uses standard halogen lighting or an aftermarket LED conversion, since the bulb type and beam pattern can change with upgrades. Some exterior lamps may also differ by trim or package, especially on trucks with different cab styles or optional fog lights. If you are replacing a bulb that has already been modified, inspect the installed bulb and connector before purchasing, because previous owners may have swapped in a non-original part. When in doubt, remove the old bulb and compare the base, shape, and wattage marking to the listing on this page.
The listed low beam bulb is 9006, and the high beam bulb is 9005. These are the main headlight bulb sizes shown for this model year.
The center high mount stop light bulb is 921.
Both the front turn signal light and the parking light use 3157A on this page.
The rear turn signal light bulb and the tail light bulb are both listed as 3157R.
The brake light bulb is 3157R.
The back up reverse light bulb is 3157.
Both the license plate light bulb and the glove box light bulb are 194.
The front side marker light bulb is 194NA, and the rear side marker light bulb is also 194NA.
The page lists multiple interior options. Map light options include 168 and 578, while dome light options include 578 and 211-2.
The front fog light bulb is listed as 9145 LED.
The daytime running light bulb is 4114.
The trunk or cargo area light bulb is 912.
The ash tray light bulb is 161, and the engine compartment light bulb is 93.
Because trim and lighting package differences can affect fitment, and some trucks may have been modified with aftermarket bulbs or conversions. Checking the installed bulb helps confirm the correct base and size before purchase.