Window Roller Replacement

A handy person from Surprise, AZ says:
Please see attached photos of my window rollers. I believe there are from an Atrium Window Series 2000 HS HS-R30-72x48

I would like to identify the replacement parts so that I can buy them.
I look forward to hearing from you.

Thank you,
Profile picture of Paul
Paul from SWISCO responded:
I'm afraid we haven't been able to find this, either. Can you tell me the width, depth and height of the nylon housing? Please also tell us the diameter and thickness of the wheels. Maybe we can find a suitable substitute, though I'm not sure.
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