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Question 1: The inner brackets for both sides "question mark shape" are 1/4". These brackets are flat. Both side outer brackets "long L shape" are 3/8". The outer brackets do have a slight radius or groove over part of the bracket, but are flat on both ends.
Question 2: I do not believe there was a pad for the rear bumper bracket to the body. I did add a thin rubber pad for my car, could not see advantage of paint on paint connection.