Where to buy pasenger side header to H-Pipe studs??

Was installing my Off-Road H-Pipe and cross-threaded the nut on the pasenger side header to H-Pipe stud. When I was trying to get the nut unstuck I ended up unscrewing the entire stud.

I tried using vice grips to get the nut unstuck. That didn't work so now I need to know where to go to buy new studs?

Would Autozone/Advanced Auto Parts have them?? (Or will I have to go to a Ford Dealership)
 
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