Thats really interesting. 
People have a tendency to glorify the past ... the "good ol days".
My dad had a 68 Charger (my first spoken word was "car" ... not mom or dad ...
) ... I remember when it was only a few years old going through a car wash in it ..... it was like running through a sprinkler ....
.... last time he tried that ...
Other cars we had from 60's and 70's always had some kind of issues .... but that was they way it was .... leaks here, belts always throwing there ... you carried extra stuff, fixed most if it yourself .... it was just par for the course ...
I have a friend today who had a 69 Charger back in the day (actually met his wife at dealership he bought it new) ... he had an alternator mount bolt that would sheer or break ... no matter what he did .... every few months or so, he would have to pull over, take a hockey lace on it to get home, and put new one in.
For issue of OP .... I wonder on the original production line if the holes in the doors were pre-drilled ... or they took what they got from polypropylene's of the day and then drilled the holes .... and if holes were pre-drilled .... well ..... the man-in-charge admits the QA/QC sucked - so even decent reproductions won't match perfectly ...
