To install a motor with emergency operation (SOS motor) in the box, since the motor head will be larger than a common motor to accommodate the joint that will be used for manual operation of the motor via the appropriate rod, you will need to unscrew the motor bolt and use the same holes with which the plate was attached on the side of the motor to directly fasten the motor head to the side of the box.
See below the image of the bolt to be unscrewed
Once the plate and the motor bolt are removed, simply mark small points on the side of the box with a pencil/marker and drill holes corresponding to the marks with a drill, then screw the motor head directly onto the side of the box from the outside.