Help finding stud

I'm sorry for not being more clear - I do not need the studs that attach the manifolds to the head (have those - Ace Hardware is great!) I need the stud that attaches the manifolds together.

The exhaust manifold has a 5/16" stud that is threaded into it with 1/4" threads on the end that goes into the exhaust manifold. No threads where it goes through the intake manifold and then has 5/16 threads and a nut on top. The diameter is important to hold it securely. 1/4" bolt would not really work.

My other option is to take a 5/16s bolt and cut the head off and have 1/4" threads put on the end.

Thought there may be a source out there. I can't be the first person to snap one off.

If anyone has one a PM would be appreciated.

Thank you to everyone for their replies.