The Saturn L100 side marker utilizes a 12961 bulb size for the lighting components located on the exterior of the vehicle. Data for the specific bulb requirements covers the period from 2001 through 2002.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Saturn L100 uses the 12961 bulb across both the front and rear side marker positions for the 2001-2002 model years.
The 12961 is a miniature wedge-type bulb in the T10 form factor, operating at 12 volts with a 5-watt output.
The W2.1x9.5d base designation refers to a wedge base with a 2.1mm contact width and a 9.5mm pin spread, a common standard in low-current automotive marker lighting.
The 12961 designation in these specifications is a Philips part number, meaning equivalent bulbs from other manufacturers may carry different part numbers while sharing the same T10 wedge form factor and 12V/5W electrical rating.
Because the same bulb size applies to all four side marker positions on the Saturn L100 (2001-2002), a single bulb type covers the full set of side marker replacements on the vehicle.
The T10 wedge base is a tool-free fitment type, as the bulb is retained by friction within its socket rather than by a bayonet or screw mechanism.