http://cgi.ebay.co.uk/HONDA-NSR-250-MC-21-REAR-DISC_W0QQitemZ8029739806QQcategoryZ10460QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Not cheap, but half the price of a new one....
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88 NSR250 R2J (work in progress!) & 05 Aprilia SL1000 Falco