68 Notch window trim

stainless vinyl top trim on the a-pillars has me puzzled. In examples of 68 up, the vinyl didn't cover the length of that pillar. A small piece of trim placed horizontally ended the vinyl at the top of that pillar. So my quandary... Since 67 didn't have reveal moldings, Was a special piece of trim required to complete a vinyl top finish.
I suppose if a special finish trim is present and the vinyl is installed the length of the pillar, drilling holes through for reveal molding clips would be the solution.
I'm thinking IF the factory had done this they would have predrilled the stainless to a clear hole size. Clips screw would catch body metal only just like all others.