The grille shell is one piece. The bezel attach to the face of the grille shell and the mounting brackets, buckets, trim rings & headlights are attached behind the grille sheel, via 4 rivets. There are no replacement parts for the grille shell, itself. In lieu of trying to cut out the rust, weld in new metal, top-dress the repair, prep, prime & paint, it would be more economical to replace the grille shell. Check craigs list or the Truck Parts For Sale forum here and post an ad on the Truck Parts Wanted forum on this site.
We have them also, but the shipping will be as much as the grille shell.