This NF5 complete clutch on Yahoo Auctions seems a good buy at 20,000 Yen / £150.00. 1 day left..................

http://www.okshon.com/v.cgi?YYurl=http://page2.auctions.yahoo.co.jp/jp/auction/b97514975

DMR is a long standing parts shop / seller on this auction site.
If you want to go this way, register with okshon and bid via their website.
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30