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How to Replace Bifold Doors Many home improvement stores offer bifold doors as kits which include the door panels as well as the installation track. The kit you purchase should have a total dimensions that are about one inch less than the width of the opening frame. If your bifold closet doors are slipping open, it could be caused by an unintentional top sliding track guide pin, or the bottom floor pin rotating might be out of place or even missing. These problems are easily and cheaply fixed. Cost Bifol