Roller replacement

A quick learner says:
We have two of these doors in our house. I took the working roller off the good door the bad door roller wheels are completely broken and falling off the axle. Glass etching on the door is PPG Herkulite K ANSIZ ? 971-1966 3/16 inch U.

We need to rollers if there is a match out there.
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Casey from SWISCO responded:

Hello,

Take a look and compare the specifications of the 81-018 to your roller assembly. Thanks for posting! 

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Alternate image for 81-018

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