Lexus GX470 front and rear side marker bulbs use 168 and 7443 sizes respectively, with each bulb size corresponding to specific marker locations on the vehicle. The replacement chart covers 2003 through 2009 model years with bulb size specifications for side marker applications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lexus GX470 uses two distinct bulb types across its front and rear side marker positions, with the 168 assigned to the front and the 7443 assigned to the rear for all 2003-2009 model years.
The 168 bulb is an ANSI-standard miniature wedge type in a T10 form factor, rated at 12 volts and 4.9 watts, placing it among the lower-wattage bulbs used in automotive marker applications.
The 7443 bulb is an ANSI-standard dual-filament wedge type in a T20 form factor, rated at 12 volts with a 21W/5W output, meaning it carries one filament for higher-intensity operation and a second for reduced-intensity use.
The dual-filament design of the 7443 allows the rear side marker to serve more than one lighting function within a single housing, which is a common arrangement in combined stop and tail light assemblies.
Both bulb types conform to ANSI standards recognized in the United States and Canada, indicating standardized electrical and physical specifications across those markets.
The T10 and T20 designations refer to the tubular envelope width of each bulb, with T10 indicating a narrower profile than the T20 used in the rear position of the Lexus GX470.
Because the 168 and 7443 differ in both filament count and wattage, the two bulb types are not interchangeable between the front and rear side marker positions on this vehicle.
The front side marker position of the GX470 retained the 168 bulb without variation across the entire 2003-2009 production span, reflecting a consistent fitment requirement throughout the model's run.