[clickman]

I sold my (useless) cupholders and related parts to someone who wanted to do essentially the same thing as you (except cupholders rather than double DIN stereo).

But from looking at some pics and my notes, it looks like the only things required to mount the HVAC controls in the bottom position are two screws and the outside trim piece.



Although I have a vague memory of the screws mounting the unit in the bottom location not being the same as those for mounting up top. And maybe not in the exactly the same location, either. Sorry for being so vague, but it was a while ago.