Please Identify Tandem Roller

A handy person from Parker, CO says:
This is a tandem roller. I didn't happen to review names or numbers when I had the door off the track. This is my Mom's door on her house built in 1997.

User submitted image of their door hardware.
Profile picture of Tom
Tom from SWISCO responded:
Thank you for reaching out to us. Your tandem roller looks like our product 81-156. Please compare our product to your current part. We also carry this product in stainless steel. See our product 81-156SS for that option.
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