Metal Runner Broken??? You mean the rail the runners slide in that is attached to glass??? It can be changed, just be careful and take your time.....................
Right for the job at hand... to remove the window glass, First you are going to have to remove the regulator, mainly to facilitate installing new glass...............Once you have door basically stripped, drill out the four rivets, and remove regulator assembly, then the fun starts, if you look closely inside outter door rubber (between doors), you will notice a notch near the top of door, there is a Allen Key head in the that limit glass raise height....remove this screw. Then making sure the mirror is removed off door, you will find 3 (i think from memory) 10mm head bolts that hold the inner door rail against the glass, ovnce this is loose inside running bar can be removed out of door...........Now then this is the tricky bit,
You need to pull the door rubber out of its grooves, along the top of door, and down door jamb at mirror end, becareful no to break rubber.....DO NOT RELEASE rubber on Outer edge of door.........
Now basically, you need to pull the rubber up UNTIL you can get the corner of the door, through the gap in the centre of the rubber......once the corner is through you can pull a complette piece of glass out, and put a new piece in.....UNTIL THIS Point, you WILL GET THE glass jambed and will find it difficult to remove past rubber limit......................
POINT...dont leave the rubber stretched out for extended period, the rubber will not come back to shape..........
Point.....Hex Head screw limiter in top of outer door jamb need now be replaced, assembly Tight as is....can get away without.
Point......Make sure to use nyloc nuts on window regulator assembly.
Point......When mounting Regulator, remember to seat glass runners first, and then attach door runner assemble.
Hope you can make sence of directions, just take your time and you will be right, the door rubber is going to be your biggest hurdle, once you figure how it goes, you will be right