So is the conclusion that the 1974 model should have the chrome pieces? Any ideas of where I can get them and if they are truly needed? Do they help keep the gap smaller?
Might I add, I believe the main problem lies in the mis aligned door, both horizontal and vertical. The exterior chrom pieces must be in one line and the door and rear panel too. The horizontal drop could possibly be due to sagging hinges on the A post. They do tend to develop 'play' over the years with the heavy doors, specially with electric window openers mechanism. Easy to check, if you pull up on the door, you will be able to tell if there is movement in which case, the hinge needs replacement.
Also, the broken seal on the passenger side/ glass which keeps water out of the door needs replacement. If caught in the rain the door will fill up with water which the E9 metal is allergic too! Will eat up the bottom of the door.
The chrome frame for the seal you can possibly get from any one parting a car. They are of a soft material which tends to scratch and warp over the years, but that is probably not causing the gap.
Keshav