Honestly, I had no idea the state of my studs so I bought the whole ER kit. I ended up having one broken one, but I am happy knowing I have new hardware in there. Also they have nice male torx provisions on the ends so you can put them in and back them out without doing the double nut trick.
In your case, I'd just grab one of these:
ARP Stainless Exhaust Stud - SR/KA/RB/VQ - Enjuku Racing Parts, LLC
But keep in mind it's going to come with a 12-point nut which you may or may not care about for aesthetic reasons (plus might get annoying if you have 6-point sockets).