I'm in the same boat. I have a pair of Cambridge Soundworks MC55 that I want to mount behind the seats on the bulkhead. Just trying to figure out the bracket needed. I still have the OEM radio/amp installed and would probably have to go to an aftermarket radio in order to run the rear speakers from the rca out. Anyone know if another set (rears) can be tapped in to the OEM amp? It looks like you can't since you wouldn't get any type of fade control.