Knob to adjust the airflow went missing (was never there?) in our car. This is designed for a Mazda 5 Touring 2007. Possibly works for other models/years/cars as well. Who knows.

This model is for the right most airvent. For the left most the model needs to be flipped in the X-axis. For any of the vents in the center console the prongs should be moved to the middle.