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A better idea would be to remove the back seat , as this will allow you enough room to get to the screws. It will be a tight fit to get in there to remove the seat but it can be done. If you need instruction for the seat and the panel let me know . I will send them.
Thanks for answering. Removing the seat won't help getting at that third screw. It is up near the glass and when I pull on it, I can see that the third screw is part of what is holding the trim on. Also, looking at the left rear door, I see no screws at the bottom that would need to be removed. I felt through the carpeting, thinking the screws were hidden by the nap in the carpet, but I could not feel any.
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The bootom is held on with push pins , and they snap off. I have enclosed the instructions in hopes that it will help you.
It would really help if you could tell me the easiest way to remove the seat. I haven't removed a seat from a car in 35 years. Also, what about that third screw, it is the one just under the words "rear door trim panel".