 Estes agreed to share in the cost and allow Pontiac to have a one-year exclusivity on this new car, the next year Chevy would follow with its version which was called Chevrolet Monte Carlo.The new Grand Prix was such a sales success in 1969 as dealers moved 112,000 units - more than four times the number of Grand Prixs sold in 1968.Full-sized Pontiacs were also substantially restyled but retained the same basic under-body structure and chassis that debuted with the 1965 model - in fact the roof-lines for the four-door pillared sedans and Safari wagons were the same as the 1965 models, while the two-door semi-fastback design gave way to a squared-off notch-back style and four-door hardtop sedans were also more squared off than 1967-68 models.