Old 5'x8' aluminum patio door rollers

A quick learner from Lahaina, HI says:
Aloha,
I can't find any manufacture names or numbers on the frame.

This is a very heavy door. Is a modern set with two rollers on each side available that would fit? Is there a higher quality than plastic rollers?

Mahalo
Bob
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Emily from SWISCO responded:

Hi, Bob.

This looks like a match for our 81-139 roller. Compare our dimensions with yours to confirm this matches up for what you're looking for. 

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