Don't know off-hand, but someone should be able to respond soon with an adequete response. More-so concerned about getting a look at the rear stud when you take it out. Mine's apparently missing, and I don't want to go through the hassle of taking the whole manifold off to see what size I need.
Do you mind taking a photo of the rear bolt so I can see it, and what size it is? If you can, I would greatly appreciate it.