slimfold steel bifold doors looking for right installation kit

A handy person from orlando fl says:
November 13, 2014
I have 2pcs 24" these doors with all the pins ( 3/8" plastic caps for all 4 pins on each door). Looking at 2 sets of 21-404 for 48" opening assuming they need both top and bottom tracks. Need to confirm before putting order. Thanks.
User submitted a photo of bi-fold door hardware.
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Paul from SWISCO responded:
November 17, 2014
I agree, the 21-404 looks like a great match. They are sold individually.
Bifold Track, 4' Opening
Bifold Track, 4' Opening
21-404
$12.75
Bi-fold Door Repairs
Bi-fold Door Repairs
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