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Posted By: bobkTigerlady, looking at the picture and since a lot of the concrete inside the garage (the garage side is on the left?) it wouldn't be at all difficult to chip out the concrete and pour new concrete so the edge will be level.
Posted By: unicorn33jerseyboy -- That sure would be the easiest, if it were doable. I'm not quite sure how one would attach such a piece to a steel door, but I could pose the question to a handyman (which I most definitely am not!).