73 Mach 1 front bumper
 

After removing my front bumper off my 73 Mach 1, it became very obvious that
the big ass metal structure had serious rust. Does anyone have any
experience in reparing these parts? I figure my local body shop can 'weld'
the cracks in the rubber, but the metal underneath is another story. And
aftermarket appears non-existent. Any helpful comments would be
appreciated.