You need one flash killer for each side of the motorcycle (2 flash killers for one motorcycle). The flash killer ensures that the indicators on one side of the motorcycle are operating in the same frequency. Moreover, it ensures that there is no "defective bulb" error message in the speedometer.
Bulb Parking Light
Bulb 12V 4W BA9S T8,5X26 S-2 T4W...
This LED auxiliary headlamp kit (including crash bar...
These halogen lights fit for all motorcycles with crash bar...