single roller assembly , Aluminium doors

A quick learner from brampton , ontario, canada says:
Doors installed in 1984 and the single roller mechanism is broken. I cannot find the single roller unit anywhere and need 4 of them. Please help.
The wheel is 1 1/4 inch. the length of the unit that attaches to the door frame is 1.5 inch from the hole to the edge.I do need 4 of these.
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Paul from SWISCO responded:

Thank you for posting on our discussion board. We do not have an exact match for this, bit we may be able to offer a couple of parts that are pretty close. Take a look at both our 81-129 and 81-262 rollers. Look each over and see if either one of these will work for you.

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