Hi Jon,
I have an SE/SP 21 shock, can't recall what condtion it's in but will check tonight.
I've also got a brand new OE MC21 Rothmans Tank - but you probably don't want to know the pricing!!
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30