IMPORTANT! These bi-fold doors are made to fit ONLY on Superior Manufacturer Brand prefab fireplaces! Only model numbers B40, BC42, BR42, HC42. Make sure your fireplace is manufactured by "Superior", It is stamped on the fireplace along with your model. If you have have existing tracks and clips and a model number of B40, BC42, BR42, HC42, these doors can be installed in less than 5 minutes. Our doors provide a clean look and an affordable price, and a no hassle installation. All of our Doors are made in the USA. Please verify your model number is one of: B40, BC42, BR42, HC42 before ordering. Your model number can be found on the metal tag on the inside of your fireplace.