Door Roller Unit, 40 years old

A home owner from Cleveland, Ohio says:
April 17, 2012
This unit is approximately 40 years old. Is there a replacement unit?
A customer submitted photo of a sliding door roller.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
April 20, 2012
Thanks for posting! We are actually bringing in a part that may work as a possible replacement for this roller. We will let you know as soon as it becomes available.
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Donna from SWISCO responded:
April 26, 2012
Hello! Please see new SWISCO product code, 81-039, sliding patio glass door roller assembly.
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