Help identify my sliding door tandem roller

A home owner from Redding ca says:
The sliding door is from mid 90's. Having trouble finding this particular roller. I can't locate a brand name for the slider either. It looks like it is secured onto the door by the 4 circular knobs on the face. Thank you
User submitted a photo of a patio door roller.
Profile picture of Paul
Paul from SWISCO responded:
Check out our 81-169 and carefully compare its dimensions to your own roller. How do they compare?
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