Searching for replacement part (x2).

A home owner from Colorado Springs, CO says:
This door has no manufacturer that I can identify. The sliding mechanism has roller bearings.
Size: 3.1/4" x 1.5" x 5/8"
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A home owner from Colorado Springs, CO says:
The door brand might be Great Lakes, GLW premier, and the sliding device Euro Glide
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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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