Mixing elbow bolts 2GM20F

[captainwireman]

Can anyone help me with the 4 mounting bolts size and length. I have access to grade 8 and I would very much want to have them with me when I go down to my cat for the replacement. Not being there now, I also would like to know the proper exhaust hose style. I have the new elbows so I am looking at the proper diameter.
Another possible problem I see is the exhaust hose seems to be kinked/flattened out in a spot. I assume this is not normal and must be addressed. Any advise or information would be appreciated.
Thanks!

[a64pilot]

Can't help you on size a length, however if your going with carbon steel be sure to have some good anti seize with you and use lots.