Weird Exhaust Leak

i removed the power steering and the bracket as well. there is a long stud that goes through the ac bracket and p/s and threads into the head. it has larger threads on the end of it where it goes into the head. is this the cause if my exhaust leak? anyone know the thread and pitch so i can plug it?

It is a 5/8 11 thread. I used a bolt about 2 inches long. I drilled out the AC bracket to 5/8 and put the bolt right through that into the EGR port. Works fine. Exhaust leak is gone. Now to fix the header exhaust leak.