I have and have had several different 70s, row crop, standard, industrial, HP, etc, and all of the tin has always fit fine.  Might be a poor fit if some of the parts have been tweaked or straightened and streched in the process, or if parts have been mixed from several tractors.  I have seen parts mixed from different tractors where the fit was not perfect, seems as if they were fit individually at the factory as needed.