The main problem you're facing appears to be that your lower inner panel is not mounted properly or has been cut off. The front edge of it should be fastened to the top of the seat base as shown in the photo that desotoguy posted above. The rumble lid stops then get mounted on top of these.
Also if your inner panel is a reproduction, it is likely missing the brace for the spare tire carrier. If your outer panel is not original, it too could be missing another bracket used in this same regard. I think there was a recent thread about these brackets. Also has been good pictures posted of how the lower brace for the rumble stop bracket gets attached. I can look for some pictures if you can't find what you need to know.
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