You have to swap the undertail, battery box, and tail lights. http://www.drexelmgt.com/Lee/tail/ complete how to with pics.
I did this same mod about a month ago and its pretty easy. I got integrated 01-02 tail light on ebay for 50 bucks. I bought my undertail and battery box from Mr. Cycle.com but i would not recommend them as there service and shipping time are awful. You can find them at any place that sells yamaha parts. The hardest part is fitting all the wires back under the seat.
I did this same mod about a month ago and its pretty easy. I got integrated 01-02 tail light on ebay for 50 bucks. I bought my undertail and battery box from Mr. Cycle.com but i would not recommend them as there service and shipping time are awful. You can find them at any place that sells yamaha parts. The hardest part is fitting all the wires back under the seat.