Bottom connector to the guide in the floor for s metal door.

A quick learner from Downers Grove, IL says:
January 30, 2019
Bottom connector to the guide in the floor. The top of the long rod has a slot to adjust the height of the door with a straight screw driver. No manufacturer's name o Rd number is available. The door is about 26 years old.
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Paul from SWISCO responded:
January 31, 2019

From looking at your photo, this appears to be an old Simonton bifold door. I believe the parts you need are the 21-001 bottom threaded adjustment pin, and the 21-200 pivot bracket. Look both parts over and see what you think. 
Bi-fold Door Pivot Assembly
Bi-fold Door Pivot Assembly
21-001
$6.95
Bifold Door Guide Pin
Bifold Door Guide Pin
21-007
$3.87
Pivot bracket
Pivot bracket
21-200
$2.12
Bifold Track Bumper
Bifold Track Bumper
21-277
$2.07
Bifold Track, 3' Opening
Bifold Track, 3' Opening
21-401
$8.71
How to Install Bi-Fold Closet Door Pins
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