Yep, since the front are used as turn signals and running lights, they will have two filiments. The rear are just flashers and will have only one filiment. Normaly due to bulb type, one will not install in the other because the pins are spaced different on the bulbs.
Like Sfair mentioned give us some numbers and pics if available.
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2007 VN900 Classic LT (Dragon Theme)
Cobra- Pipes, FI2000, Passenger Floor boards, Engine guard and luggage rack.
Memphis Shade with 9" windshield.
Chrome covers for neck, radiator, Rear brake Master Cylinder, and regulator.
RC Components Nitro Chrome wheels w/ Night Dragon Tires.
Çobra Power Flo breather