UPPER STEERING COLUMN BEARING GREASE?

It isn't much more than a glorified bicycle bearing. Is there a full service bicycle shop in your town? Might read like a wild goose chase but I know others have found the solution there. Those may have been different models though.
Yup. A lot of older bicycles use loose ball bearings (no cages).
Some motorcycles too.

As far as 67 vs. 68. not the same. I don't reall the differences off hand, but its pretty obvious when you see them.

I assume you've seen this, but if not
1967 Imperial & Chrysler Steering Column Service Book - Session 241