NOTE: Door and Install Tools are not included in package. Bi-Folding Sliding Barn Door Hardware Kit, Black Flat Track Top Mount Roller. For Two Doors, Track length Fit door opening. 3FT / 36″ Kit – 2 doors fits? 30″ door opening and two 17 wide doors. 40″ Kit – 2 doors fits? 34″ door opening. And two 19 wide doors. 42″ Kit – 2 doors fits? 36″ door opening. And two 20 wide doors. 48″ Kit – 2 doors fits? 42″ door opening. And two 23 wide doors. 60″ Kit – 2 doors fits? 54″ door opening. And two 29 wide doors. 66″ Kit – 2 doors fits? 60″ door opening. And two 32 wide doors. 72″ Kit – 2 doors fits? 66″ door opening. And two 35 wide doors. 80″ Kit – 2 doors fits? 72″ door opening. And two 39 wide doors. For Four Doors, Track length Fit door opening. Doors fits? 54 door opening. Doors fits? 60 door opening. Doors fits? 66 door opening. 17.5 wide doors. Doors fits? 72 door opening. 19.5 wide doors. Doors fits? 78 door opening. 20.5 wide doors. Doors fits? 84 door opening. Doors fits? 90 door opening. 23.5 wide doors. Doors fits? 102 door opening. 26.5 wide doors. Doors fits? 114 door opening. 29.5 wide doors.