I have the same mount and I bought it at the truckstop (Pilot) along with the radio and antenna. I believe it is labeled as a "body side mount". I had no problems grounding it when mounting. In the second image you can see a little of the cb mount from the opposite side.
I have a whip antenna on my other vehicle (Dodge Ram) that was installed by someone else and the setup I did in my VX blows it away!
http://www.firestik.com/Tech_Docs.htm