Rear seat back removal

I am trying to remove the rear seats.on my 1978 400 The seat bottoms were not a problem once I figured out that they are secured by a few bolts. I tried to take out the seat back and removed the screws at the base of the seat but was not able to remove the seat. I did not want to force the issue, but is there another screw or bolt that secures the top of the back seat top?

 

Thanks. Now I feel more confident to pull it up. I was surprised with the seat bottom as most current cars you can just pull up. When it wouldn't budge I ran a mirror underneath and saw the two bolts.

 

Thanks. I will check the trunk and see if there are bolts on the Series 1 400's. Don't recall if there were two or three bolts at the bottom of the back and will check.

 

Since you mention the screw is up high at the center, I am assuming the only way to loosen this screw is through the boot.