Exhaust leak at catalytic converter joint

[mp3deviant721]

I just bought a truck and recently found out that the exhaust joint connecting the cats to the rest of the exhaust pipe is leaking. It looks like I maybe able to just replace the gasket and hardware. In the event that I find that there is more wrong than that, is there a good way to replace the whole joint and not have to replace the whole exhaust system?

 

[Explorin94]

Before the convertors is a gasket and bolts and after should/might be a donut.