12 ft Galvanized Steel Box Track and Hardware Trolley Track : Moore Industrial Hardware : https://www.mooreindhardware.com
Amazon.com: 4 Pack Channel Trolley Track Hanger Bracket for All 1-5/8" Strut Channel,Heavy-Duty Track Intermediate Support Hanger : Industrial & Scientific
Black Steel Heavy Duty Box Track Ceiling Mount Sliding Barn - Etsy
Hardware Trolley Hanger, Heavy Duty Hanging Wheel, Sliding Barn Door Hardware Hanger Hanging Rail Pulley, Sliding Track Roller - AliExpress
Ceiling Trolley Track | Overhead Rollers
Products - Cannonball: building product supplier
Amazon.com: Dia 46mm Steel Double Wheel Rail Hanging Trolley Silver Sliding Track Roller Hanging Barn Door Rail Trolley Wheel H3-3 w/Nuts : Tools & Home Improvement
Monsma | C'BALL 9" ADJ.DELRIN SQ TROLLEY 6PR/CT
Exterior Barn Door Hardware | National Hardware
BOX TRACK Hardware for Sliding Doors up to 5,000 lbs.
2PCS YUEBM Track Roller Wheels Accessory Parts of The Beam Trolley System Used with Box Rail Strut Channel to Mount Heavy Barn or Shed Sliding Doors: Amazon.com: Industrial & Scientific