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Don't even fiddle with those gaps til you are sitting on your good body mounts.
So what I have found is that you need to either cut off or fold in that backing section about midway down in order to get the outer skin to sit flush. I'm guessing from the factory they were probably squeezed together by machine when spot welded. The last one I did I had to pull back apart 10 times to get the perfect body lines but they are mint.