I went the other way and fabricated some aluminium plates, using the 4 mounting holes. Certainly a bit more fiddly to remove than the race bike (with just an R-Clip), but not too bad.
On my headlight, I just bonded a metal plate to the inside of the fairing, covering the headlight hole. Then painted it white to make a number plate, its looks OK, but when I've finished all the other projects I'll get around to doing a fibreglass job like Charles me thinks.
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30