As the model

number implies, this is for those whose vehicle uses a 3157 type brake light bulb. This is the type of bulb which plugs into a socket rather than twists into a bayonet base. Commonly used in scooters these bulbs have a black plastic base which is pushed into its receptacle after the taillight lens has been removed. The LED array is applied to the helmet using the double faced tape. Just peel the backing and apply to the helmet. Instructions make the job easy and reliable. Refer to the adjacent photo to match the bulb to yours.