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How to Replace Bifold Doors Many home improvement stores offer bifold doors in kits, that include door panels and installation track. The door you purchase should have a combined width that is about an inch smaller than the size of the opening frame. If your bifold closet doors are slipping open, it could be because of a loose top sliding track guide pin, or the bottom floor pin rotating might be out of place or not present. The problem can be solved easily and inexpensively. Cost Bifold