The tail, upper and lower are all standard 2001 and newer RS250 body work.

http://www.nsr250.net/rocketracing/EQUIPMENT.htm
and here are a couple more pics of the body work
http://www.nsr250.net/rocketracing/Gallery/PICGALLERY.htm

You can get it from Magical Racing, Siebe Moto (or something like that I think) as well as a bunch of other suppliers. I like my Magical Racing. Shark Skin is nice as well.
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Charles Gallant