The Lexus GS430 front and rear turn signal bulbs utilize a 7440NA or 7440 size. The replacement chart contains bulb specifications across 2001 to 2007 model years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Lexus GS430 uses two T20 wedge bulb types across its production run: the 7440 for model years 2001-2004, and the 7440NA for model years 2005-2007.
Both the 7440 and 7440NA are single-filament bulbs rated at 12V and 21W, meaning they draw the same power and serve the same electrical role in the turn signal circuit.
The T20 designation refers to the physical wedge base format, which is a common automotive bulb form factor used in both front and rear signal applications.
The 7440NA variant differs from the standard 7440 in that it features natural amber glass, which produces an amber light output through the glass itself rather than relying solely on an amber lens housing.
Both bulb types conform to ANSI standards applicable to the US and Canadian markets.
The front and rear turn signal positions on the Lexus GS430 share the same bulb specification for every model year listed, meaning a single bulb type services both positions on any given year.
Because the 7440 and 7440NA share the same T20 base, 12V rating, and 21W wattage, the physical fitment is identical between the two types, though the amber glass coating of the 7440NA is a functional distinction relevant to vehicles with clear or non-amber lenses.
Substituting a 7440 for a 7440NA in a housing designed around the natural amber glass of the 7440NA may affect the color output of the turn signal, as the amber tint would no longer be contributed by the bulb itself.