Sometimes the factory CB antenna cable is under the dash, but in our coach it was hiding inside the upholstered driver's side control panel, below the window; you may have to remove the upholstered section to locate it. After descending the driver's windshield post, the cable goes left or right, apparently at the installer's discretion.
As I recall, the power connector was found coiled beneath the small access panel atop the drivers dash, and had to be fed down around the steering column. The grey connector may be what you want, but see if it matches your CB plug; I would expect a dedicated plug configuration that fits only one device type.
Your coach may be entirely different, but if that's not it, I'd check the places I mentioned.
And a hearty welcome to the BAC, Brian! If you still encounter difficulty finding the cable and wires, don't hesitate to ask; someone here has probably been there, done that on your model coach.
Joel