Well, it depends on the width of the door. If the door is 49” a 48” track would likely not work. In which case I’d go with a 60” track and cut it down to 49”. But if the door would fit inside a 48” track that might be the way to go. What is the width of the door opening? Another option, depending on the width of the opening and the door, is to go with the 48” track and use furring strips on the inside of the door jambs. It all comes down to the dimensions.
That's what I was thinking myself. I am looking at the sizes of bifold track that HD sells. I see that they sell a 60" bifold door track for 4 doors. Where would you cut it down so that you don't eliminate any essential holes or stuff?