The remote control dial plate was part of the receiver and was stored under the tube cover on that threaded stud, you would think they would be more common than they are, but most are in the unobtainium zone.  Don't know if later in the production if they stopped putting that stud on the cover and included the dial with each receiver, but that would seem to complicate the problem of changing the receiver to a different freq range and not having the proper dial plate for the remote control without having to make another procurement request.  I picked up a couple receivers from a place in NC a few years ago, 'Forgotten Fields', and both had the dial plate on the stud under the cover.

Charlie in NC