Help identifying replacement patio door roller hardware

A quick learner from Mystic, CT says:

We have two Dorwal heavy brown metal patio doors from 1974 which need new rollers.
The doors measure approximately 48"W x 79"H x 1"D.
Can you help us identify what replacement rollers we need without taking the doors out beforehand?

User submitted a photo of patio door track.
Profile picture of Paul
Paul from SWISCO responded:
Hey, Kristin. Is there any metallic AAMA sticker in the top or side master frame? That would be a huge help. Depending on Dorwall Series you could have our 81-033 for the 400 Series, 81-027 for the 800 Series, or 81-030 for 1100/1200 Series. Alternatively, you could remove your existing roller from the door and see how well our pictures and dimensions compare.
A professional from CA says:
81-154 or 81-033 seem likely since they have the adjustment hole above the assembly screw.
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