I've got similar flares on my coupe. The radius is quite large for a 1200 though. I got them from a place called Fibreglass Auto Replacements and from memory they are in Warkworth. If anyone is interested I'll find out the address for certain, it's on the sticker inside the flares.
My ones are 75mm wide which are bigger than those in the photo but I think they also make them in 50mm. I'll try post a pic of my coupe to give you an idea of what they're like.
Price was NZ$150+GST for 4. Which must be dirt cheap for you Americans. Sent a cheque and the flares were on the doorstep next day. They're bloody strong too, swiped a bank at a gravel sprint and thought 'there go the flares on that side' but there wasn't a mark on them.