Can anyone tell me about the stud set up for this exhaust manifold? I recently had a machine shop do some work on both manifolds which had broken studs and they were able to just press out the broken studs from the right hand side. No thread marks where the studs go. Are these one piece studs that go all the way through the manifold and service both sides (3 total) or are they shorter, 3 per side (6 total) and are they pressed in?

Thanks for your help.