The Jaguar XJR side marker utilizes a bulb size of 12961 for the lighting components located on the exterior of the vehicle. Available information covers the span from 1995 through 2009 for the specified automotive application.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Jaguar XJR uses the 12961 bulb across all listed model years for both front and rear side marker positions, making it the sole bulb type present in these specifications.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor with a W2.1x9.5d base, operating at 12 volts and 5 watts.
The T10 designation refers to a tubular bulb approximately 10mm wide, and the W2.1x9.5d base describes a wedge-style base where the glass envelope itself acts as the retaining mechanism rather than a metal cap.
At 5 watts, the 12961 is a low-output bulb suited to marker and position lighting functions rather than primary illumination.
The front side marker position on the Jaguar XJR calls for the 12961 across the 1995-2009 model year range.
The rear side marker position specifies the same 12961 bulb for the 2001-2009 model year range.
Because both the front and rear side marker positions share the same bulb specification, a single bulb type services both locations on the vehicle.
The W2.1x9.5d base is a standardized wedge fitting, meaning physical fitment compatibility with other T10 wedge bulbs of the same base type is generally possible, though electrical ratings should match the original 12V, 5W specification to maintain correct circuit behavior.