Stevens91gt

ok so my car has been loud as hell and i didn't really look into but it finally got to me and i looked on the passenger side of the engine and where the exhaust meets the headers the bolts are gone. so i need the bolts that connect the 2 together asap because i want to fix it and it's probably why it's been running like crap. anybody know? where can i get them? i went to autozone/kragen and they had some but they weren't the right size

thanks