What I did for the ones on my SAS C-WEST 350Z was use a thick chunk of plastic slightly longer than the length of both canards combined, carve the shape of the canard "wing" so they matched from left to right, then use a piece of paper to cut, fit, cut, fit, cut, fit... (you get the point) until I had a perfect shape for the wing to body mating surface. Then transfer the shape of the paper to the pre formed wing to cut out the mating surface.
blue represents material removed, red represents final part.
