Lexus ES330 inner tail light requires a 168 bulb size while outer tail light requires a 7443 bulb size. Replacement chart covers 2004 to 2006 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lexus ES330 uses two distinct bulb types across its tail light system for the 2004-2006 model years: the 168 for the inner tail light and the 7443 for the outer tail light.
The 168 bulb is an ANSI-standard miniature wedge type with a T10 form factor, rated at 12V and 4.9W, reflecting its role as a low-intensity position or marker light.
The 7443 is a dual-filament wedge bulb with a T20 form factor, rated at 12V with a 21W/5W output, where the higher wattage filament typically serves the brake function and the lower wattage filament serves the running light function.
Both the 168 and 7443 bulbs conform to ANSI standards applicable in the United States and Canada, indicating standardized sizing and electrical ratings across those markets.
The T10 and T20 designations refer to the tubular envelope width of each bulb, with T10 being narrower than T20. These two form factors are not interchangeable with each other.
The dual-filament design of the 7443 means it cannot be substituted with a single-filament bulb in the outer tail light position without losing one of the two lighting functions it serves.
The 168 bulb's 4.9W rating places it among the lower-wattage miniature bulbs in automotive use, consistent with its application as an inner tail light rather than a primary brake or signal source.
The wedge base construction of both the 168 and 7443 means neither uses a metal bayonet or screw base; instead, the bulb is held in place by friction from the socket walls.