Unless your plates are all newer than the old basket you should replace the plates too. A worn basket can/will wear on the plates "fingers" since there is a gap between the fingers and the worn basket the plates have a tendency start slamming into the basket when the clutch is popped/dropped and from aggresive shifting. If you put in a new basket with worn plates the slamming effect can continue on the new basket.
A new clutch plate kit will include new springs also which is good if your still running stock 01 springs that will be worn out by now most likely.
Dont forget to soak your new plates in oil overnight, and to loctite the bolts that will hold your new basket to the gear assembly.
Not trying to talk you out of the Wiseco basket but if you want to save a couple bucks you could go with this one:
http://www.magicraci...-08_p_2755.html
When I bought my used 03 I went ahead and replaced all the clutch parts except the PP and used the above basket in the link with cheapo EBC plates and springs, two years later and its still holding up, I will say Im not that hard on it though. If your having to slip the clutch alot a look at your jetting may be in order.. bad jetting = more clutching = faster wearing clutch parts.