International Sliding window Roller Assembly

A handy person from Redwood City, CA says:
I am trying to find a replacement roller assembly for both sides of an International Sliding Glass window. Attached is a picture of the assembly installed. Would you be able to provide information on which roller assembly would be a replacement for this? Also are there instructions available on how to replace the assembly for this type of roller assembly.
User submitted a photo of a patio door roller.
Profile picture of Paul
Paul from SWISCO responded:
It's hard to tell what you have without seeing it removed from the door. It might be our 81-039 roller, but you should remove it to check dimensions, just to be sure.
A professional from CA says:
You might want to consider a tandem roller with this door (it looks like a door - not a window. Is it?).
I would check if the bottom rail is wide enough to fit a 81-056.
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