I just got this LX450 last week and I wanted to get my Ham radio into it. The PO had one and left the antenna mount, external speaker and a cable for his own radio. The main (faceplate) cable was incompatible with my radio so I had to undo his wiring. I also undid the old speaker and placed mine under the cup holder on the center console.
To mount the radio I took out the little card holder doohicky and modified the dash mount into it. I drilled some holes into the front of it and got some new longer screws and now it is screwed on from the outside. I ran the faceplate cable in through the back of this where I drilled a hole. The mic is also mounted on the console next to the cup holder.
Pics:
The radio is mounted back here since the PO had power already to go:
Modified mount above the tape player, this doesnt show the screws going in from the front holding it in:
Finished install:
(Actually, it's not too bad... 
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