60-63 Windshield Trim Differences

[markeb01]

Does anyone know the history of the two different types of 1960-63 stainless windshield trim? Until recently I never realized there were two different designs. I picked up a set of the thin version and they measure ½” wide. They seem to have an equal amount of gasket showing on both sides of the trim like on a 64-66:






There is also a much wider style that appears to almost completely cover the gasket like these shots:





I’m curious if one was originally a GMC design and the other specific to Chevy, or was one or the other a unique 1960 design that changed sometime during the 60-63 production run? Or maybe different assembly plants used one style over the other?

I wonder why GM would go to the effort to redesign the trim when the 64 cab was right around the corner in regards to engineering/production lead time. Perhaps one style was easier to install?