Hello, I am the second owner (my uncle was original owner) of a 1968 Buick Skylark GS Custom Convertible. 350-V8 The rear panel and trunk say GS but not front fender or grill. At car show this weekend a guy told me if that is original it was special order or he added it on. I know for a fact my uncle wouldn't have added anything to the car. Still have original paint, interior, seats , everything original. any one else out there have this model or input ?