Help with replacement parts for Better Built windows.

A quick learner from Tucson AZ says:
Need to replace this tandem roller assembly. The windows are aluminum sliders by Better Built from the 1990's.
Thumbnail of the uploaded file named Tandem Roller Assembly
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Jasmine from SWISCO responded:

Thanks for writing in! Your tandem roller assembly looks a lot like the 87-171. To determine this is the right, look over the dimensions below. Carefully compare them to your roller assembly to confirm.

Alternate image for 87-181
Alternate image for 87-181

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