70 door window runs (elevator shafts)

I understand that the front and rear window runs (elevator shafts) on the driver side door are the same, and the front and rear window runs on the passenger side door are the same, and finally you can not interchange the driver side window runs with the passenger side window runs. My question is how do you tell the difference between the two sides? Is there a shape difference? Or is the only way to tell is to look for a part number, and where would that parts number be ? While I know the above information now, I did not know this prior to mounting the windows in the doors. I have a few alignment issues.

It is the angle of the ‘foot’ or bottom bracket is welded, in relation to the shaft tube.

So the foot at the bottom end of the shaft is pointed towards the inside of the car. If you were to look at the shaft from the side (not mounted in the door) you would say that the angle between the saft and the toe of the foot is obtuse. Your description is indicating that one of the angles is more obtuse than the other. Which side is more obtuse? In other words, if you had 4 shafts on the floor that were removed 9 years ago, how would you decide which pair goes where?

if you sit the bottom flanges on the ground, two verticals will lean one way and the other two will lean the other way. Then, if you sit one in the door with the flange sitting flat on the bottom of the door, it will become readily apparent which ones go to which side by whether or not the holes at the top line up with the threaded holes in the door.

Make sense?

Thank you.

You are very welcome!