Is "C&C" Cars & Concepts, in Farmington Hills, MI? If so, you might have some trouble getting parts. This is a quote from b4black's website regarding the '82 GN's:
The next step was to create an actual prototype. The was accomplished by Cars & Concepts, in Farmington Hills, MI (now defunct). http://www.flash.net/~rjgeorge/prototype.htm
Now they're out of business? This could be a problem. You might PM b4black on here and see if he has any info.