Chevrolet Tracker front turn signal bulbs use 1034NA or 1157NA size, while rear turn signal bulbs use 921 or 1156 size. The replacement chart covers 1998 through 2004 vehicle 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 Chevrolet Tracker front turn signal uses one of two bulb types across its model years: the 1034NA or the 1157NA, both of which are dual-filament bulbs operating at 12V with a 21W/5W output and a BAY15d bayonet base.
The 1034NA is a variant of the 1157NA, with the key distinction being its natural amber glass envelope, which produces the amber signal color directly from the glass rather than relying on a colored lens or housing.
The 1157NA shares the same BAY15d bayonet base and 12V, 21W/5W rating as the 1034NA and is likewise finished in natural amber glass, making the two bulbs functionally and physically similar within the BAY15d family.
The BAY15d base used by both the 1034NA and 1157NA is an offset dual-contact bayonet fitting, a design that prevents incorrect single-filament bulbs from being seated in a dual-filament socket.
The Chevrolet Tracker front turn signal used the 1034NA for the 1999-2001 model years, switched to the 1157NA for 2002-2003, and returned to the 1034NA for 2004.
The rear turn signal on the Chevrolet Tracker used the 921 for the 1999-2004 model years, with the sole exception being 1998, which used the 1156.
The 921 is a single-filament wedge-base bulb of the T15 type, rated at 12V and 16W, and it does not use a bayonet base, making it physically incompatible with sockets designed for the 1156.
The 1156 is a single-filament bulb with a BA15s bayonet base, rated at 12V and 21W. The BA15s base is a single-contact fitting, distinguishing it from the dual-contact BAY15d base found on the front turn signal bulbs.
Because the 1998 rear turn signal uses the 1156 with a BA15s bayonet base while all subsequent years use the 921 wedge base, the two socket types are not interchangeable, and substituting one bulb for the other is not possible without a socket adapter.
All four bulb types listed in the specifications, the 1034NA, 1157NA, 921, and 1156, conform to ANSI standards applicable in both the United States and Canada.