NOTE: Door and Install Tools are not included in package. Top Mount Roller Bifold Sliding Barn Door Hardware Kit Black Flat Track Modern. For Two Doors, Track length Fit door opening. 3FT / 36″ Kit – 2 doors fits = 30″ door opening and two 17 wide doors. 3.3 FT / 40″ Kit – 2 doors fits = 34″ door opening and two 19 wide doors. 3.5 FT / 42″ Kit – 2 doors fits = 36″ door opening and two 20 wide doors. 4 FT / 48″ Kit – 2 doors fits = 42″ door opening and two 23 wide doors. 5 FT / 60″ Kit – 2 doors fits = 54″ door opening and two 29 wide doors. 5.5 FT / 66″ Kit – 2 doors fits = 60″ door opening and two 32 wide doors. 6 FT / 72″ Kit – 2 doors fits = 66″ door opening and two 35″ wide doors 6.6FT / 80″ Kit – 2 doors fits = 72″ door opening and two 39″ wide doors. 7 FT / 84″ Kit – 2 doors fits = 78″ door opening and two 41 wide doors. 7.5 FT / 90″ Kit – 2 doors fits = 84″ door opening and two 44 wide doors. 8 FT / 96″ Kit – 2 doors fits = 90″ door opening and two 47 wide doors. 9 FT / 108″ Kit – 2 doors fits = 102″ door opening and two 53 wide doors. 10 FT / 120″ Kit – 2 doors fits = 114″ door opening and two 59 wide doors. For Four Doors, Track length Fit door opening. 4 FT / 48″ Kit – 4 doors fits = 42″ door opening and four 11.5 wide doors. 5 FT / 60″ Kit – 4 doors fits = 54″ door opening and four 14.5 wide doors. 5.5 FT / 66″ Kit – 4 doors fits = 60″ door opening and four 16 wide doors. 6 FT / 72″ Kit – 4 doors fits = 66″ door opening and four 17.5″ wide doors 6.6FT / 80″ Kit – 4 doors fits = 72″ door opening and four 19.5″ wide doors. 7 FT / 84″ Kit – 4 doors fits = 78″ door opening and four 20.5 wide doors. 7.5 FT / 90″ Kit – 4 doors fits = 84″ door opening and four 22 wide doors. 8 FT / 96″ Kit – 4 doors fits = 90″ door opening and four 23.5 wide doors. 9 FT / 108″ Kit – 4 doors fits = 102″ door opening and four 26.5 wide doors. 10 FT / 120″ Kit – 4 doors fits = 114″ door opening and four 29.5 wide doors.