This top mount classic sliding barn door hardware includes: 

Rollers: 3" wheel and 2" inch wide straps
Track : 2" wide
6 to 9 hex lag screws
2 track stops
8 bolts
6 to 9 spacers
1 adjustable door guide (2 pieces)
(The track does not come pre-drilled)

Clearance needed above top of door: 5 1/2″

*If the track needs to be a bigger than 9ft it needs to be in two parts