Originally Posted by JCA
Does anyone know the exact dimensions of the stock head unit?
You won't find an after market replacement the same size if that's what you're thinking, all double DIN stereos will require you to cut or remove a metal brace inside the dashboard that exists to support the stock HU.
If you buy a 6.1" double DIN (which is a pretty standard size) you'll need a mounting kit which is essentially a pair of plastic brackets which screw to the HU and the inner dash mount. They serve the dual purpose of holding the unit in place and of filling the gaps at the side, like so:
There should be enough room to install a 7" head unit, but I haven't seen a bracket to mount it (because I haven't looked for one, not necessarily because one doesn't exist - I'm sure it must).