Alcan patio door roller replacement

A handy person from UK says:
The patio doors are becoming difficult to move, I need to find replacement rollers. The doors were made by Alcan and fitted in the late 1970's! they've lasted well and it would be good to get them to last a little longer. I can see no marks on the doors to help identify.
I would be grateful to know if you can supply a replacement,
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Paul from SWISCO responded:
I cannot identify what you have based on this information alone, but you could consider our 81-133. Is that a match? If not, please remove the roller from the door and post pictures of it here for us to see.
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