Hangars for patio screen

A quick learner from USA says:
Can you identify these hangars for patio screen?
User submitted photos of a patio door roller.
Profile picture of Paul
Paul from SWISCO responded:
Hello! We may be able to help. Could you give us your dimensions? I would like to know the diameter of the wheel and the offset of the housing. The offset can be seen clearly in your second picture above; it's the horizontal "gap" in the housing. Let me know!
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