The KTM 400 Duke front and rear turn signal bulbs both utilize a 5008 size bulb specification. The replacement chart covers 1994 to 1995 vehicle production years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 5008 is the sole bulb type specified for the KTM 400 Duke across all listed positions and years, covering both front and rear turn signals for 1994-1995.
The 5008 operates on a 12-volt system and uses a single filament, meaning it serves one lighting function rather than combining two, such as stop and tail.
Its base type is the BA15s bayonet mount, a single-contact fitting where the "s" denotes a single pin offset, distinguishing it from the dual-contact BA15d variant.
The 5008 is classified as a lower wattage variant of the 1156 bulb, sharing the same BA15s bayonet base but drawing less power, which makes the two types physically similar yet not electrically identical.
Because the 5008 and 1156 share the same base configuration, the 1156 can physically seat in a 5008 socket, though the higher wattage of the 1156 may affect circuit behavior and component load on the KTM 400 Duke.
The 5008 designation follows ANSI standards applicable in the United States and Canada, indicating the bulb conforms to a standardized specification for those markets rather than an ECE or JIS classification.