If its ride height adjustment you are looking for, you can also consider a RS125 shock. It'll need a revalve and respring, but now and then a cheap 2nd hand one pops up (like for £40!!)
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30