The number of seats to the number of the car seat manufacturer announced based. Generally addition to individual small car manufacturers defined as four vehicles, most commonly used cars are five cars.
“general car are five car”
Some high-end cars because the middle seat position to place the back of the VIP control system, it could be four models.
“Some high-end car is four.”
and some large SUV and MPV because there is a third row seat, it is seven car .