Not sure if this is the same for the 6.5, i have the 4.3...but there are 2 plastic push pins that hold a plastic wire holder under the head unit. I disconnected the wire harnesses that go to that and pulled that out (easier to do than it is to type up and describe). With that out, then it is very easy to get to those "difficult" bolts. I had all the room to put my hand in there under the head unit and use sockets.