There are 2 anti-jump disks for keeping roller on rail and an up-side-down T shaped guide stabilizes the bottom to keep it from swinging as it's moved from side to side. This modern twist on the classic barn door not only saves space, it allows the ability to open up multiple rooms.
eBay
Black Paint T Shape Triangle Hinge Cabinet Shed Wooden Door Gate Hinges Hardware
Aliexpress UK
(8) Bypass brackets (1 rail hole need 1 set). For Bypass 2 Doors. 8 ) Bypass brackets (1 rail hole need 1 set). For Bypass 4 Doors. Sliding Length: 4ft-16ft for your choose. 1)Adjustable Roller hanger screws（from 3cm to 5cm), You can adjust the screw to the most suitable thickness for your door.
eBay
Vintage Brass Cabinet Handles Antique Drawer Pulls Wardrobe Knobs Furniture Hardware for Cupboard Door Drawer Decorative
Aliexpress UK
US Barn Door Hardware. UK Barn Door Hardware. Bypass For 2 Doors. Bypass For 4 Doors. Fits sliding Door Thickness: From 1 3/16" to 2". ·Anti-jumpers - The little round discs won’t allow your door to be lifted off the rail.
eBay
Stainless Steel U Type Door Handles Dresser Knobs Kitchen Cabinet Knobs and Handles for Furniture Hardware Diameter 8mm HomeDeco
Aliexpress UK
• Item: 4-16FT sliding barn door hardware(Hardware only, door is not included). • Suitable for the bedroom, study room, living room, kitchen etc. For single doorOR double door. For Single Door: For Double Door.
eBay
Cabinet Handles Knobs Aluminum Alloy Door Kitchen Knobs Brushed Cabinet Pulls Drawer Modern Furniture Handle Hardware
Aliexpress UK
It adds a unique look to the barn door, easily creating a personalized space. Roller Assy Size Width 6.8cm, Height 26.4cm (including connection structure). Roller Bolt x 4. Roller x 2. They have low rolling friction, enabling smooth door opening and closing without jamming.
eBay
Square Furniture Hardware Black Cabinet Handle Stainless Steel Kitchen Door Knobs Cupboard Wardrobe Drawer Pulls
Aliexpress UK
Modern style is suitable for indoor decoration in kitchen, bedroom, dressing room, club, pub and so on. Waterproof and rust resistant tract kit also a nice door accessory for barns, garages, stables, etc.
eBay
10pcs Bronze Hinges, Folding Hardware Hinges for Doors, cabinets, Furniture, Vintage Jewelry cabinets
Aliexpress UK
[ Fits 29-1/2~42-1/8" Doorway Width]. [Fits 42-1/8"-72-4/5"Doorway Width]. Sliding Barn Door Hardware Kit. Adapt to door thickness: 1-1/5" to 1-3/4",less than 21" Wide.4FT Sliding Door Hardware Kit fits maximum SINGLE Door leaf width:21".
eBay
2pcs 180 Degree Foldable Hinge Flap Screw-On Hinges For Sewing Machine Cabinet Door Hinge Furniture Hardware Accessories
Aliexpress UK
Slick Sliding : Sliding barn doors with premium sliding rollers, the mini barn door hardware ensures smoother and effortless door opening and closing, enhancing convenience.Used to cover internal cupboard space and help slide doors easily to keep your cupboard storage tidy.
eBay
10pcs Arch Style Polished Metal Handles Solid Aluminum Alloy Cabinet Door Drawer Pulls Modern Simple for Furniture Hardware
Aliexpress UK