Thirty four pictures, some poorly taken, showing the old and new head units and brackets side by side, being removed/installed:
http://q.spilky.com/bosecdhu/
These show the whole process step by step, plus there's bonus pictures of a cardboard box and my computer desk for some reason. I was going to make a writeup out of them but apathy beat me.
In these pictures, I attempted to use the existing brackets because they wouldnt come off, thus the fitment issues. DONT STRIP THE SCREWS OR YOU WILL BE SORRY.
Note that it will not play CDRWs.