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That's where the problem is. Try the usual shops, cycle gear cycle world precision sunrise. But I highly doubt they'd have it stocked. Another thing is if you're looking for the stock one? Check aroun and see if the r6 sprocket fits and then check classifieds.
check out the Cycle Gear... they stock vortex sprockets for the R6 on the shelf. They have alot of them there and they are cheap in comparison to even Ebay.