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A quick learner from Athens TX says:
April 23, 2021
Upper bifold door guide. Lip rides on channel not in channel. 1970's era hardware.
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Casey from SWISCO responded:
April 27, 2021

Hello,

Take a look and compare the specifications of our 23-172 top guide to yours. Thanks for posting! 
Top Guide
Top Guide
23-172
$4.95
Bi-fold Door Repairs
Bi-fold Door Repairs
GUIDE
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