Picked this up from Yahoo Japan. It was described as an MC18 F3 Rad. I have no idea.
What's throwing me is just the 2 coolant entry / exit ports, rather than 3, which seems the norm for HRC rads.
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30