Mounting Thumbwheel Radio

I am putting my dash back together on my 69 Dart. The car had an aftermarket radio stuffed in the dash when I bought it but I am mounting the original thumbwheel radio back to make it look like it is supposed to look and to accommodate the new dash bezels. I was wondering does the radio attach with the big screws going through the dash into the radio face or is there a case (or whatever it is called) like modern radios use to mount into the dash?