hello, Although i don't have access to where the builder procured the final barn door hardware you can get a good idea of whats avail be through Rustica Hardware
http://rusticahardware.com/barn-door-hardware/

Thanks for that. But Rustica is on the HIGH side in terms of pricing, not to single them out. I did a little more research and found more reasonable pricing on barn door hardware (half as much) from t-motor sports -- example ( http://www.t-motorsports.com/6-6-ft-country-dark-coffee-steel-sliding-barn-wood-door-hardware-black-antique/)

Real Sliding Hardware has sliding barn door hardware for every taste! From refined to rustic. Check us out!