It should be 'Pony-Car'? Sport Coupes are generally speaking, Monte Carlos, Thunderbirds, etc. In later years (80s-90s), they could be defined as 'Sporty Personal' that would include the GM10 cars like Grand Prix, Lumina, and also Buick Grand Nationals, Monte Carlos and Thunderbirds. They are 2 doors, and 4 seats. 'Sports Cars' are Corvettes, Porsche 911, and Cobras. Sound reasonable?