Bifold doors are available for sale, but custom-ordered doors can also be assembled into folding doors, as long as they're resized to fit your needs. [BR]When measuring the closet opening, account for a small gap around and between the doors. [BR]Measure the horizontal opening of your doors, subtract 13/16 inch, and divide by 4 to get the individual door width. Measure vertically and subtract 2 and 7/8 inches to get its height. 2. TRACK HARDWARE
The hardware that comes with bifold-door set can be flimsy. We've found its often best to order separate hardware[EMDASH]a kit that includes the track, the hinges, and all the pins and pivot plates[EMDASH]for a smoother, longer-lasting operation. A couple of companies, like Johnson, offer heavy-duty tracks that make the doors glide smoothly.3. DOOR PULLS
Smaller cabinet knobs will get lost on a larger door, so look for "wardrobe knobs" or any knob that is 1 and 3/4 inches or bigger in diameter. 4. 1x2 FINISH-GRADE FLAT STOCK
You'll need just one piece to create a valance under the header to hide the track. 5. 21/2-INCH TRIM SCREWS
For attaching the 1x2 stock.