The ATK GT250 uses a 5008 bulb size for both front and rear turn signal applications. The replacement chart covers 2011 through 2014 model 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 ATK GT250 uses the 5008 bulb in both its front and rear turn signal positions across the 2011-2014 model years.
The 5008 is an ANSI-standardized bulb type recognized in the United States and Canada, operating at 12 volts.
It is a single-filament bulb, meaning it serves one lighting function rather than combining two, such as stop and tail, into a single unit.
The 5008 uses a BA15s bayonet base, which is a single-contact bayonet mount that locks into its socket with a twist.
The 5008 is a lower wattage variant of the 1156 bulb, sharing the same BA15s base type but drawing less power during operation.
Because the 5008 and 1156 share the same base, physical fitment of a 1156 into a 5008 socket is possible, though the wattage difference means the two are not direct equivalents and substitution may affect circuit behavior.
The uniform use of the 5008 across both front and rear positions on the GT250 means a single bulb type covers all four turn signal sockets on the vehicle.