Catalytic converters/front pipe flange

Hi all,

Earlier in week my girlsfriends car started making a horrendous rattling noise and upon inspection I noticed a couple of sheared bolts connecting the bottom of the catalytic converter to the front pipe.

Has anyone attempted to drill and re-tap the holes? Any advice I’d prefer to not have to replace the entire cat if possible.

I’ve attached an image of the current state of the flange. I believe I’m missing some parts is anyone able to identify any of them for me?

Thanks in advance for any help