Rollers from Patio Sliding door on a Mobile home built in 1996

A quick learner from Michigan says:
I have been searching for replacement rollers for my patio sliding door on my mobile home which was built on 1996. I am sure due to the age of the door and the building the marking, numbers and name of the door has been worn away. If you can help me out, I would greatly appreciate it. I need (2) rollers.
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Bob from SWISCO responded:

Thanks for posting. Start by looking at our 81-004 , 81-023 , or 81-279 . Compare their dimensions to your old roller, particularly the height and width of the housing and the diameter of the wheel, and see if one of these matches what you need. 

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