assembly plant in Oshawa, Ontario, Pontiacs had parallel model lineups as "full size" Chevrolets: the Pontiac "Strato Chief" had similar trim level and upholstery as Chevrolet's "Biscayne", the "Laurentian" matched the trim level of the Chevrolet "Bel Air" and while the Parisienne offered similar amenities as Chevrolet's "Impala", the Pontiac version had unique and more costly upholstery fabrics, and beginning in 1964 the "Custom Sport" (later rebadged the "2+2") two-door hardtop and convertible model line was in lock-step with Chevrolet's "Super Sport". Finally, starting in 1966 Pontiac offered the "Grande Parisienne", a two-door and four-door hardtop models parallel to Chevrolet's luxurious "Caprice," although Grande Parisiennes through 1967 used the styling of the US-market Grand Prix. Also for 1967 and 1968 a Grande Parisienne wagon was offered. Through most of its life, the Parisienne resembled the US-market Bonneville despite its Chevrolet underpinnings. In contrast, the Pontiac Motor Division of GM in the US manufactured models with drivetrains, chassis and equipment unique from the other GM stablemates—Chevrolet, Oldsmobile, Buick, and Cadillac. Through much of the 1950s through 1970s, the American Pontiac model lineup included the "Catalina", "Ventura", "Executive", "Star Chief" and as the top of the line model, the "Bonneville". Additionally, unique to the US lineup until 1969 was the "Grand Prix", a distinct 2-door hardtop model with unique styling features and both luxury and "sporty" accoutrements such high output V8s, bucket seats, tachometers and flashy trim pieces. The mix of Pontiac exterior styling on an economical Chevrolet chassis and drivetrain at a price point marginally higher than Chevrolet, was a huge marketing success for GM of Canada. For decades "full-size" Pontiacs took third place behind Chevrolet and Ford in sales, typically 70,000 plus units annually. In contrast, heavier and bulkier American Pontiacs, with far higher sticker prices and higher operating costs due to large displacement V8s requiring high octane fuel, would have little appeal in the Canadian marketplace for a number of reasons: a population base one tenth the size of the US, a less stratified society with lower disposable incomes, more prudent spending and savings sensibilities and far higher taxes and gasoline prices. On the manufacturing side, maintaining unique part availability for a low sales vehicle along with import-export tariffs and barriers between the U.S. and Canada would make the sale of American Pontiacs unprofitable in Canada. In 1977, GM had downsized its full-sized lineup. Pontiac continued with the Catalina