3 - if we are still talking about the attachment for the front pipe to the manifold (for a 'normal' 2a).
Mate, if your old ones came off no sweat I wouldn't worry about it. I bought new ones because I had to replace my manifold - the damned thing was broken and the studs snapped
So I bought new studs and nuts from fwd.com.au for the manifold I was given.

