Due to a recent incident with my bike, I'm having to replace the headlight assembly. Anyhow, I really prefer the dual lows/highs of the 05 model, instead of the single low/high setup of the 07. How hard would it be to use the 05 assembly on the 07? How much work would be required? Would I need a headlight assembly from both years, or can I just modify the 05 assembly to fit on my bike?