Sliding glass door roller assembly.

A quick learner from 28405 says:
Door is around 20 years old. Have no model or part number.
Hope you can help. Would need 4.

Thank you.
Thumbnail of the uploaded file named Roller scan.jpg
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Casey from SWISCO responded:

Hello,

Take a look and compare the specifications of our 81-033 patio door roller to yours. Thanks for posting! 

A quick learner from 28405 says:
Perfect. Thank you.
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