Bolts and nuts for Cat back exhaust
 

Hi,
I got my SLP LM cat back for 98 mustang GT convertible. Obviously my studs from h-pipe to cat back all rusted out. Any advise what bolts/nuts I need to use to attach my new cat back to h-pipe? I can figure out the size, but what I need is material SS, zinc, grade, what type of nuts, lock nuts, or normal, any washers (split)? I'm really lost and for 2 weeks already no luck with online search. Your help would be greatly appreciated!!
Thanks!

Maybe you could pull them from a Mustang in a junk yard?

Junk yard? Lol...Well, for 20 year car in junk yard these bolts are probably fully rusted out anyways...

Use a propane torch to heat up the nuts and then slowly work them off.

Well, my question is not about how to take them out (I already didi that), but what type of new fasteners I need to put on?

Stainless steel.

Thank you very much!