The Radio Information Board

I bought a TK-790 and a TK-890 separately from Ebay. The TK-890 had previously been part of a dual band setup and has the the KRK-7 end cap (for lack of a better word) on it. The TK-790 has the end cap for a remote head...it has the plugin for the remote head and no plugin for a second radio. A guy is selling a KRK-7 end cap on Ebay that I think would work, but here is my question:

Is there a second smaller cable that runs from the main radio to the end cap that I would need? I can't find a parts list for the kit or a good detailed picture of the KRK-7 kit.

On the caps of the 7DB's, one needs to say to control head and radio 2 and the other says to radio 1.The second radio (the one not connected to the control head) will need slight modifications to work properly.

Jordan