1968 pella 8 foot sliding glass door

A quick learner from Akron, Ohio says:
I am in need of replacement rollers for my slider. One of mine broke and I am having a hard time opening and closing it. Can you tell me what I need to be back in business again?
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Tom from SWISCO responded:
Sure, I'd be happy to. Please show us a picture of the roller in question out of the door and we can recommend a replacement.
A professional from CA says:
As far as I can tell (81-098 / 81-249) were the only choice in 1969. I couldn't find the date they changed, but 81-244 is the current roller. I keep asking, but I have not heard a reason why they are not interchangeable.
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