I'm replacing the cat tomorrow on my 2001 GT. I'm lucky enough to have a father in law who got me a GM style for $140 bucks. I'd like to have some extra bolts and nuts on hand in case if and when we break a bolt. I need to know size, length, grade, stuff like that.

Just to be clear I'm replacing the entire pipe with the cat welded to it from the manifold back to the intermediate pipe. This also includes the flex coupler. Total of 6 bots/nuts from what I can tell. Thanks!