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How to Replace Bifold Doors Many home improvement stores sell bifold doors as kits that include doors, the track for installation and the hardware. The kit should be about one inch smaller than the frame opening. If your bifold doors are squeaking open, it could be because of a an unreliable guide pin on the top of the sliding track or if the rotating floor pin on the bottom is out of place or not there. These problems can be fixed easily and inexpensively. Cost Bifold doors have a sleek and modern look