What rollers are these?

A quick learner from VENICE,FL says:
I need to find out what rollers these are. Nylon roller held in by one screw with adujustment screw below the mounting bolt. Also, how to I get the rollers out? Need 8 rollers.
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Tom from SWISCO responded:

I'm afraid I can't tell what rollers you have. I can't see any defining attributes, obscured as it is. You will have to remove it in order to identify it. To do this, you may need to remove the bottom rail of the door. Some patio glass doors are designed this way.

A quick learner from VENICE,FL says:
Was able to take lower rail off, 1 1/2 roller
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Tom from SWISCO responded:

Thank you! This looks very close to our 81-020, though you may want to carefully check the dimensions we show on its store page to be 100% sure. They look good to me, but it's better to play it safe.

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