do you know how to wire it up?
if so, get a LOC wire it in behind the headunit......then run your rcas from that.....dunno if the bose system has any frequency adjustments for the rears (they sometimes tweak the low/high on the rears of boses system at higher volumes for sound staging)...power, look on your firewall for a grommet, and poke a hole through...depending on the size of the power wire that is....how many watts you going to push?
you really only need the radio diagram to find what speaker wires you need to tap into.....or you can pop the door panels off and look at what color they are and go from there....the12volt.com is a great resource.....there is no radio diagram, but someone on there might know off hand, or be able to look it up the metra installer site....