Exhaust question

[RT22]

anyone replaced a hardbody cat? What size and pitch are the bolts? I want to get some from a nut and bolt place but need the size, I am sure as old as mine are they will break at least one or two and would like to have them in hand before removing the cat and gutting it. No inspection here so I am not replacing it, just gutting it . Also are the gaskets dealer only item or can a parts store fill that part? I am trying to find out at local parts store but wondered if anyone here has done this already and have any hints for the parts. dealers are way to outlandish for such basic parts. Not too mention have to order every damn thing for this truck. Thanks in advanced for any tips on making this easier than dealing with dealer.

[PEZi]

the gaskets can be found at places like NAPA... the bolts it doesn't matter if you're replacing them, just make sure they are big enough to stay in the holes