When you say "one of them" do you mean the buttons and LED models? The newer Centracom Gold Elite? Or the newer, compact buttons and LED system?
At any rate, you can inquire with your local Motorola Authorized Retailer and they will be happy to sell you a console system. You can attach mobile radios into all of these options, but these systems are going to be extremely expensive new, and probably hard to find used. The systems that are not the new, compact buttons and LED system are more than just a PC, CIE, and monitor - they have a CEB sitting in the background running everything. A CEB is a card cage that contains the interfaces into the console operator position, trunked systems, conventional base stations. It also includes a clocking card for the TDM bus timing. It will also require a Elite server to serve the alias and console databases to the console operator positions.
The compact option is a smaller unit, but it is much like the older buttons and LED system and looks pretty ancient and as I recall can only support about 4 radio max.
Just want to make you aware of what you're getting into because a Motorola console system is not a simple animal.