It does not seem to me that it would fit your camera.
For the Super Graphic you want a Cambo SC focusing screen- the rear half of the non-revolving Cambo 4x5 graflok back, it will attach just like your Super Graphic focusing screen, and it will hold a Cambo reflex viewer. These are both fairly common items. They cost more money, but the solution is "plug and play" and works very well in the field. You would also need a fresnel on the rear side of the ground glass or you won't see the corners with many lenses.
According to Ian, the sellers hood would not fit your Super Graphic back.
I am not sure, but it might be possible to modify this hood. Others have done similar, modifying a Polaroid MP-4 hood to fit a Super Graphic. Try searching google for ["super graphic"] and [mp-4 reflex hood] and you may find details on that modification. This might be a MP-4 hood, it looks like one to me, but I am not an expert on that item. Such a modification would require work and research by you or your repair person.