Sliding Glass Door rollers, capital

A quick learner says:
August 21, 2017
The roller is in a rectangular holder that fits inside the bottom frame and is held by screws.

It's on a 6' wide sliding glass door with thermopane house built in 1978 by Pond and Spitz in Medford NJ
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Tom from SWISCO responded:
August 21, 2017
Welcome to SWISCO. It can be tough to identify a roller. We'd like to see it and know the diameter of the wheel. Can you measure and send us photos of your roller, removed from the door?
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