As my MC18 has now got a 17 inch rear wheel fitted I asked Kayla at Projection Components to make me a set of HRC link plates. She came up trumps and now has them for sale on her website... I have to say her stuff looks ace and I even got a small bag of Haribo in the deal...
http://www.projection-components.co.uk/nsr250-mc18-f3-hrc-spec-suspension-links-aluminium-1322-p.asp