Exhaust Flange Bolt Replacement

[East_Bound]

What's up guys -

I have a small exhaust leak on my truck. It seems to be coming from one of the exhaust flanges and also from the closest cylinder to the firewall from block to exhaust manifold, unless my ears are deceiving me. I have attached some photos below.

When I went to tighten up the four bolts to the two flanges, I noticed two of them were stripped. Is this a one piece assembly? (Bolt is permanently on the thread?) Regardless, where can I purchase this part?

I also noticed that the first and last bolt to the exhaust manifold to the block looks to be broken off. (pictures below) Is this how they come or is something that happened overtime? There is no exhaust leak from front, only from back. Thanks in advance!

-Nick