Sliding glass door assembly

A home owner says:
This is an assembly from an older sliding glass door. The house was built in 1957. I am unsure of the age of the door. The only marking I can find are on the glass door Twindow Herculite 3/16.
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Tom from SWISCO responded:

Thank you for your patience in this matter. Unfortunately, we have not been able to find an exact replacement for this roller. The closest we could track down was our 81-071, which looks fairly similar. Look over our dimensions and let me know if you think you could use this as a replacement.

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