Which stud or bolt do I need for my M20 exhaust manifold? ('89 325iC)

[Joey Link]

I'm missing a stud bolt and I need to either find a bolt that will work (preferred) or purchase a stud and nut. I see RealOEM lists two different studs, but I'm not sure which one I need.

http://www.realoem.com/bmw/showparts.do?model=BB13&mospid=47326&btnr=11_1047&hg=11&fg=50

If anyone could tell me the size and thread pitch of a bolt that will work, I'd really appreciate it.

[AdamF 88iS]

It doesn't really matter which you get. Just one is 5mm longer than the other. I'd get the longer one myself.

[Joey Link]

Ah, gotcha. What's the proper way for setting exhaust studs?

[FredK]

Stud puller socket, or two nuts tightened against each other (if you don't want to spend any additional money on a tool, just to install one stud).