Radiator frame fix

I'm wondering what the best approach is to fix the tabs or frame that mounts the radiator to the car. Not the screws that attach the rad, as those are fine but the physical case around the radiator that then screws to the rad. When I was taking it out for the motor pull I noticed that only one side on the top and bottom was actually attached to the radiator. It looks like the factory used a sort of glue or something. Can I just spot weld it back on? What is the correct way to do this?