This detail of a "center bar" or a divider bar in this opening is new to me.
Another nuance of differences between 67 and 68. Notice Bill's 67 could have never had the divider (like mine never had a divider). In my opinion, it was stamped using different stamping dies.
If I were restoring a 68 with factory Convenience Group, I would make sure this WAS NOT a factory alteration before repairing the divider.