[DavidG]

No, they are not slotted, but they are somewhat oversize, hence the use of countersunk washers (unless it is a super-early body which had smaller holes in the pillar and no countersunk washers). However, they are not oversized enough to provide for a 3/16" adjustment. What is a bit surprising is that it is your passenger side door, which normally would have far fewer openings and closings than the other door and therefore less wear on the hinges and hinge pins. It is not out of the realm of possibility that the body is a mis-build. Yours would not be the first that I've encountered.