Bifold mirror door track piece

A home owner from Michigan says:
I have a bifold mirrored door whose bottom track has a plastic piece that slides back and forth in a grove in the bottom track to support and "guide the moving side of the bifold door. The plastic sliding piece is installed in the track prior to settin the bottom track in place. This plastic piece is what I need.
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Tom from SWISCO responded:

Hello! Please see our 21-174 roll guide. I think this may be just what you were looking for.

21-174 : Roll Guide
Roll Guide
21-174
$1.20
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