of the body panels were cut down from the Master which had ceased production. Aside from the 4-door T10 sedan, the T16V 3-door van version was introduced in October 1958 as Toyopet Coronaline. Originally, the T10/16 Corona was fitted with the old sidevalve "S" engine, with . In April 1958 the Corona underwent a light facelift, with a new hood ornament and door handles. The tail light design of this generation is reminiscent of the 1949 Ford sedan. The OHV P series engine replaced the old S in October 1959, and offered substantially more power with at 5,000 rpm. The P-engined Corona sedan was capable of traveling at , higher than the old S-engined model. The car also underwent another facelift, including a mesh grille and a new rear seat which allowed seating for five rather than the previous four. As regulations regarding taxis at the time required engines no larger than , dealers restricted the power for taxi vehicles. Due to the upgrade in dimensions of the Crown, Toyota needed to continue manufacturing a vehicle with similar size dimensions to the first Crown, primarily to be used for taxi usage. This vehicle was also the first Toyota's car with a monocoque chassis structure, and an independent front suspension using double wishbones. Due to the monocoque chassis, Toyota was able to produce a vehicle under . Second generation (T20, T30; 1960) This generation of the Corona was also known as the Tiara (in keeping with the crown naming convention) when exported by Toyota Motor Corporation. It was introduced at a critical time for the company in North America. Their first flagship car, the Toyopet Crown, was unsuccessful in the US market, and the Corona was added to offer a choice along with the Land Cruiser. At the time, there was little market for an off-road vehicle like the Land Cruiser. The front mask of the T20 Corona is reminiscent of the 1955–1957 Ford Thunderbird, and shares its appearance with the entry-level offering, called the Toyota Publica. The Tiara was introduced to sell alongside the Crown, as a smaller companion. Introduced in March 1960, the car was powered by a 1.0 L "P" series motor. With a three-speed manual transmission, top speed was a mere . In March 1961, Toyota introduced a more powerful 1.5-litre "R" series motor, the same motor from the Crown, and an even larger 1.9-litre engine was