I started to pull out the rear seats today so I could replace a dead rear speaker. The bottom came out with no problems but I can't budge the back of the seats. I removed the 2 small nuts on both sides and then the 2 large ones that the belts are attached to. Now I'm stuck, I can't figure out where to go from there. What am I missing?

I just remembered that there are 2 nuts in the trunk that could be attached but I'm done for the night so if I don't hear otherwise, I'm going to try them tomorrow.