A muscle car forum debate over whether a Buick Riviera is a 68 or a 69 usually reveals more about the car than any spec sheet could. This particular Riviera wears a mismatched blend of grille and bumper styling from both years, the kind of detail only a handful of Buick devotees would even notice. Read on to find out exactly what separates a 1968 Riviera from a 1969 one, and why the two years get confused so often.