If no one on the forum has this, which will be a pretty rare item, you could try contacting Padgetts Motorcyles in the UK (Dewsbury, West Yorks).
They are an official HRC shop, and their race team used to run the NSR500V. They still have one in their showroom!
http://www.padgetts-motorcycles.co.uk/12997/contacts.htm
By the way, that's one heck of a Engineering project you guys are running
_________________
Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30