Backrest disassemble.

[Beumers]

Hi all.
In order to get to the upper mount of the back shocks I tried to disassemble the backrest of the backseat. The manual says there are 4 screws on the lower side of the seat. The 2 at the outer corners are easy to find, but there have to be 2 in the middle behind the storage locker. In my car there is a metal mountingplate for the hinges but there are no screws to find. I tried to unlock the plate because it looks like this should be possible but there is no way it will release. In the manual and the OEM is a different mounting plate for the hinges.
Anyone who recognizes the plate on the photo's and more important where are the 2 screws in order to release the backrest.

Regards Henk Beumers.

uploading the photo's failed but maybe someone can answer my question never the less.