69 Valiant Grille

I can see your problem with that large opening which I don't have on mine. (Yours looks too nice to weld anything closed) ....Perhaps you could get a piece of metal and drill a center screw hole, then slide it in behind, over-lapping the inside outer edges as a backing plate. Use a screw and washer to secure the grill mount tight.

Just a quick suggestion..or what I would do.