I have a '78 Spider, that has been pieced together from multiple cars, I have a top frame for the car in decent enough shape, but I am trying to identify it as a CS1 or CS2 frame. I have seen the sketches on some top manufacturers' websites, and have searched the forum, but I wanted to confirm what I have.
Looking at the top-side of the front left bow:

I really need to work on my photography skills... can take more tomorrow.