Sliders from glass doors

A home owner from Ct says:
Can't find brand name on slider or doors. These get installed at bottom of door where standard wheel based sliders would go. Instead of wheels, they have white cylindrical bearings. Asked several places and noone has seen one like these. Any help is appreciated. Thanks
Thumbnail of the uploaded file named IMG_3385.jpeg
Thumbnail of the uploaded file named IMG_3386.jpeg
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Bob from SWISCO responded:

Many thanks for writing in. I am afraid this old 'tank tread' roller is no longer made. However, we've had people successfully use our 81-279 as a replacement. The adjustment screw sits a little higher than on your old roller but the wheel rides better than the noisy treads. Take a look and let us know what you think.

Alternate image for 81-279
Alternate image for 81-279

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