Lexus RX330 inner and outer tail light bulbs both utilize a 12961 size bulb. The replacement chart covers 2004 through 2006 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lexus RX330 uses the 12961 bulb across both its inner and outer tail light positions for the 2004-2006 model years, through February 2006.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor with a W2.1x9.5d base.
The T10 designation refers to a tubular bulb approximately 10mm wide, commonly found in low-intensity automotive lighting applications such as tail lights and parking lights.
The W2.1x9.5d base is a wedge-type base, meaning the bulb is held in its socket by the tension of the base itself rather than by a bayonet or screw mechanism.
The 12961 operates at 12 volts and 5 watts, which is consistent with a marker or tail light function rather than a primary stop or turn signal application.
The identical bulb size across both the inner and outer tail light positions means a single bulb type services all four tail light sockets on the RX330.
The 2006 model year entries for both tail light positions carry a "To 02/2006" notation, indicating the specification applies only to vehicles produced up to that date within the model year.