Set up your own bi-fold doors using 30" door leaves or bypass doors using 32" door leaves. You may need to cut the doors if the door opening is only 80" tall. There may be a problem with that, most doors will only let you cut 1" off any side, top or bottom before you get into the core of the door.....Not good... If you are having trouble finding something off the shelf, you need to assemble what you need using the same parts the the ready made ones use. You should use a heavier gauge hardware for it, since there will be more door "hanging out there" than the smaller door arrangements. This is referring to bi-fold doors, by pass doors will not have that issue since all doors are hung from a track.
If you want a kinda bi-fold door and your finished opening is very square, level at the head and plumb on the sides, you can set the first 2 door leaves on either side of the closet opening like any other hinged door, 3 hinges on each, door stop on the jamb head and sides. The screws will need to be long enough to go into the framing on this one. once those leaves are in place and acting proper, hold them in place with magnetic catches at the top. This all done should give you a 5' opening to deal with. With the same hinges that are used on the other panels already in place, set 3 more on each panel on either side. You will need to get the sizes right or trouble will occur while operating the doors. This is, just to mention some that should not be done by a first timer. If you can do it it will work. When it is all finished yo have the capacity to open up a 5 ft wide door on either side and fold it back on itself. Magnetic catches will be needed at these panels too.
Not the best way to work it, but if your jamb is predefined in its' sizes, it at least an option to consider. If you opening was 82" +/- your options for by pass or bi-fold hardware would be simpler.