Okla. Stat. tit. 47, § 47-12-403: Mirrors

A. Every motor vehicle shall be equipped with a mirror mounted

on the left side of the vehicle and so positioned and located as to

reflect to the driver a view of the highway to the rear of the motor

vehicle.

B. Every motor vehicle shall be equipped with an additional

mirror mounted either inside the vehicle approximately in the center

or outside the vehicle on the right side and so positioned and

located as to reflect to the driver a view of the highway to the

rear of the vehicle.

C. Every school bus and church bus shall be equipped with a

mirror system so positioned and located as to reflect to the driver,

when seated in the bus driver's position, the presence of a

pedestrian directly in front of the bus and beneath the driver's

direct line of sight.