haha...I didn't say that...I said it wouldn't be pretty.
The problem, or the hard part, is the side # plates. On the '03-up, they connect into the airbox...whereas on the '01, they overlay the airbox. Soooo, you'd have to swap airboxes too, if that's even workable. Anything's possible if you really want it bad enough...it all depends on how much time and effort you're willing to put into it.
Me personally, would leave the '01 plastics on it, as the "L" 250's are a sexy machine in stock/factory trim...maybe change up the colors of the plastic a bit. I threw on black fenders, and black side plates on my '00...just to change up the look.