Why? It is a commodity not being sold in car supplies. I think that it is even better if you can freely choose the main body and the scent of hope if possible. In order to attach directly to the air duct, it is good that the fragrance drifts in the car with the wind.
Installation is like drink holder attachment, vertical louver horizontal louver compatible. Since the air freshener can be used as it is, it can be continuously used just by exchanging contents and it is reasonable.