From EDAC, this 516 series rack and panel connector comes with a protective back shell, a guide pin and connecting jack screws. The connector housing is designed to use female and male contacts, which are available separately.
Stock No. 910-8383 is a 56 way Rack and Panel Connector Housing with a Top Entry Back Shell, Guide Pin and Jack Screws
Stock No. 910-8386 is a 56 way Rack and Panel Connector Housing with a Side Entry Back Shell, Guide Pin and Jack Screws