A 10" CRT's neck is too deep to fit into a Classic case.

The insides of a Color Classic also will be a very tough fit - if they will fit at all.

Finally, if you actually have a Color Classic II, that's a pretty rare find - if your CC II currently has a case, even a damaged one, I would recommend keeping it, and perhaps using a regular CC case as a donor to replace the damaged parts of your CC II case - while keeping the CC II name badge of course.