Technical Exhaust fitting kit

[gadb]

Greetings,
Buying a cheapo middle exhaust section off eBay (~£100) for my 1.4 but I suspect I need other bits. Couldn't see any posts on exhaust fitting kits - perhaps this is such a rudimentary thing that nobody else asks, but believe it or I am that green.
So far, I think I need a gasket to join the front to middle and some assembly paste to join the middle to back. I suspect I might also need some nuts & bolts (front join) given the appearance of the ones there at the moment - incidentally, what size are those bolts, anyone know?
Anything else I missed?
Thanks in advance!

 

[John202020]

Not sure but 10mm bolts and penny washers

 

[Jockstrap]

No such thing as a kit. The standard has two mid way rubber type hangers. Need to check that both ends and hanger fittings are solid.
Bolt size? Take one out and measure.