I don't have the latch sqeauk, but did have the left side a-pillar junction squeak. I knew it was at this junction point, because when it would occur, I would push very hard upwards at this point, and the noise would stop.
Took it to the dealer, they "adjusted" it, threw a little oil in there, and we're good for now. This was in combo to my blown speakers I had...
That rattle I could never locate which I assume is that spring was driving me bonkers! Thanks so much for telling me, I would always go "ok where's that noise coming from" to anyone who sat in the car!