This is my guess: http://www.jtsprockets.com/catalogue/sprocket/JTF259 You'll need to remove your sprocket and measure to be sure. If it's correct, you'll find it on eBay, or just about any bike shop could order it for you.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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