I believe you just kneel on the floor in front of the bench, facing the upper back rest. Push down somewhat and push toward the trunk firmly, then simultaneously lift up. There are just little "hook" assemblies on the floor into which bars on the bottom of the seat lock into and those need to come free from the hooks before the seat can be lifted up.
Yes that is true... removed my 68' rear seat a little while back.
the hooks on the rear portion are facing down, while the hooks on the seat portion are facing towards the back. (if I remember correctly). SO you have to push down to clear the first set in the back, then push forward with the lower seat portion to clear the other set. I can send a pic if you need more explanation. Just PM me i guess and i'll go take a pic. tomorrow sometime.