Exhaust Downpipe bolt is stuck

(99 V6) So I have an issue with my downpipe ATM. My driver-side downpipe has a bolt that seems stuck, and I'm not quite sure what size of a bolt I need to get for my year. One of the bolts is fine, but because one of them isn't there, I currently have an exhaust leak. Kinda makes it sound :poo:ty when Im driving, even with my aftermarket pipes.

Does anyone know the size/thread of the bolt+nut that I need to get so I can finally fix this thing? And if you know any places such as Autozone or AAP have them? And any idea on how to get this stuck bolt removed?
 

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