I need top and bottom guides for a 40 year old metal bifold closet door

Both the top and bottom guides are alike. These are shaped as U .They have track slots on each side of the U with a pin thru the bottom of the U. The top view of the guide shows a rectangular shape of the nylon guide overall. The pin is mounted thru the metal door via nylon washer/collars which also need replacement. The pin springs and clips are reusable.