I need to replace the cargo nets on the front seats of my '87 300E (both frames broken). This will require removal of the backs of the seats to replace the screws that hold the frame on. I tried taking out the 2 screws at the bottom, but the back of the seat will not budge. Can anyone tell me how to remove the seat backs? I have the CD, but it is not helpful. Your experience and suggestions will be greatly appreciated.