1992 300D 2.5 turbodiesel. 229982 miles.

When I saw the exhaust manifold, it seemed as if one bolt (or stud) at the rear (the closest to the passenger) were missing.

I looked more carefully with a small variable angle mirror that I use to see my teeth.
It seemed that the bolt (or stud) was broken.

How can I remove that broken bolt (or stud) to put new bolt (or stud)?