Cat converter.

So my catalytic converter literally exploded on me. I have all the replacement parts and am working on it now. I have 4 of the five bolts off but can get to the one behind the altanator. I need to slide the alt over to get behind it but can’t seem to fine the bolts to undo it. It’s a 1.8 k series. Please help it’s driving me mad.
This little bolt seems to be rounded so I can’t remove that top plate!!!
Thanks

I had the same problem...I succeded in sawing the head of the bolt off, and then replacing the bolt.