Patio door rollers 30 years old

A quick learner from Menomonee falls, wi. says:
There isn't anything im sure it is Remington, code 81-007 but it has nylon wheels, if that makes a difference.
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Tom from SWISCO responded:

I agree, this looks very similar to our 81-007. That's about all I can say, though. You will ultimately need to compare our dimensions to yours in order to confirm if this product can work for you.

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