Roller at the end of the crank arm

A quick learner from Philadelphia PA says:
September 19, 2020
The roller at the end of my left opening window is all chewed up. It falls out of the track underneither the window.

Any ideas on where to get a replacement roller?
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Bob from SWISCO responded:
September 23, 2020

I am afraid those rollers are not sold separately by the supplier. I apologize for the inconvenience. Now we can supply a replacement operator. The operator itself is likely either the 39-031 or 39-032; just go over all the dimensions, especially the length of the link arm, to ensure it matches up. Let me know if anything differs. 
EntryGard Dual Arm Operator
EntryGard Dual Arm Operator
39-031
$29.70
EntryGard Dual Arm Operator
EntryGard Dual Arm Operator
39-032
$29.70
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