Built custom sliding barn doors using purchased hardware. This came with little door guides that run in a slot on the bottom of the door. Once installed I realized the doors could have been closer to the floor and thus closer to the guides. On occasion and with wood movement the guides would come out of the tracks.
I created these to be taller but otherwise an exact replica of the original.
Added another version that is 1/4 inch taller (6.5mm taller)