I just bought a RS125 shock in decent condition for £45.00.
But be careful, these (and some other) piggy back reservoir type shocks will not fit the NSR with the standard subframe / battery box.
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30