Downpipe bolt sizes?

Ducklakeview

Lifer
Merseyside
Gonna gut the secondary cats on my car this week hopefully, but before I start does anyone know what size nuts and bolts I'll need for the downpipe to manifold joints? I know they'll probably be buggered and I'm prepared to cut them off with a 3" disc if I can get in there or does anyone also know if I'd be able to get to the bit of the bolt between the flanges, as thinking I might be able to cut there with the plasma.

Thoughts?

Mike
 
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