This as-yet-unnamed 1955 Vapid Stanier is a full-size classic car due to appear in Grand Theft Auto VI, seen in yellow and white outside the Boardwalk Hotel on Vice Beach's Ocean Drive-style strip in the first trailer. It appears to be based primarily on the 1955 Ford Fairlane Crown Victoria, and its placement seems to nod to the yellow-white Oldsmobile Super 88 famously parked outside Miami Beach's Avalon Hotel.
Vehicle data via GTA Wiki (Fandom), CC BY-SA 3.0.