I was able to remove the latches on my '68 doors by unbolting the track, but thankfully did not have to remove it entirely. It was tight and it wasn't pleasant, but it came out.
Never had them out on my '71 so I don't know if any minor changes other than the welded frames took place that would make it different.
Sorry I don't have any further insight regarding videos or other resources Concrete. But Steve's diagrams are pretty detailed and should at least get you where you're going.
Paul