Old roller assembly for sliding glass door

A home owner from Little Rock, Arkansas says:
This door was probably original to the 1972 house. I need to find replacement roller assemblies. I've attached photos.
Thumbnail of the uploaded file named roller side.jpg
Thumbnail of the uploaded file named roller top.jpg
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Paul from SWISCO responded:

Please compare our 81-004 to your roller assembly. Please note thickness of the housing and wheel diameter.

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