I don't know about Crouse-Hinds, but I do know that Sq D will sell you replacement interiors for their panels; perhaps Crouse-Hinds will, as well.
If they don't, or if the cost is more than a whole box (not unlikely, due to economies of scale), you could buy another of the same box, and just swap in the new interior. That would save you effort of roughing everything into a whole new panel.
