The grille is not attached to the shell as described above.
The grille is inserted into the back of the radiator shell. There are no fasteners holding the grille to the radiator shell at the top. About three-quarters of the way down on the grille there is a bracket on each side of the grille and these brackets are bolted to mating brackets that are part of the lower radiator shell support on each side. This support is riveted to the bottom of the shell as one unit. Also, the bottom of the grille is bolted directly to the inside of the lip at the bottom of the radiator shell with small screws and nuts.
Once the grille is inserted into the back of the radiator shell it will be obvious as to how the grille is attached to the radiator shell.
Good luck!
