Rear Pad in 67 Dart?

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Installing is in process. I'm going crazy trying to get the wrinkles out.
I regret not taking a professional installer. But its hard to find somebody that can do this job in Germany. The only one I found told me that he maybe can do it in the wintertime...
I wonder how the wrinkles change when the top gets warm in the sun.
I am also not sure if the Kee top has the perfect shape...