Off of a Better Built alum framed window from 1998

A contractor from Arizona says:
5/16 brass wheels.
Don't see you carry a duel wheeled assembly to replace my damaged unit.
Any help as to leads where to find or other brands that would be comparable would be appreciated.
User submitted photos of a window roller.
Profile picture of Tom
Tom from SWISCO responded:
Hey, Tim. Our 87-181 looks similar. How do the dimensions match up?
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