Sliding glass door roller assembly replacement

A home owner from Syracuse, New York says:
August 10, 2021
As soon in the picture the present assembly has B on one side 7116-5 on the other and a capital A inside a circle. I believe the door is an Anderson but it's a least 20 years old. We did clean the old ones and the door is moving better but still seems to continue to not roll as easily as it did. The rollers are metal as well as the whole assembly.
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Casey from SWISCO responded:
August 16, 2021

Hello,

I think you might want to consider our 81-128. Your picture shows what I believe is just the inside portion of the 81-128 roller unit. Remove the rest of the housing, which may still be inside the door frame, and check it out to see what you think. Thank you. 
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