I am trying to remove the cat from my 92 sport. But i'm having some trouble, i have let the bolts sit in a break free solution for about an hour, and they still won't budge. Does anybody know the size of the bolts that hold the cat on? i removed the bolts from the end connected to the muffler, now i'm stuck on the last 2 bolts at the front. I'm trying to use a 9/16 but its not working, it keeps slipping and i'm worried about rounding it off... thanks!