metal sliding window roller

A quick learner from chevy chase , md says:
There are no identifying numbers or company name. Help. I need four. This is for two very heavy 1965 apartment windows that slide to open.
User submitted photos of a patio door roller.
Profile picture of Paul
Paul from SWISCO responded:
Hello! This window roller assembly looks like it might have been custom made by the window manufacturer. I found one in our inventory that might work for you, but I'm not sure. See our 87-106. If you just need the wheel, not the housing, send us a photo of just the wheel with dimensions. We may be able to find something.
A quick learner says:
This looks very close. The window is VERY HEAVY so I don't know if this plastic housing would support such weight.? How much weight does this part support?
Profile picture of Tom
Tom from SWISCO responded:
No, you're right, our 87-106 won't support anything that heavy. We are currently trying to find a better match, but just in case we don't have any luck, would you be able to just replace the wheel, like Paul suggested?
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