top mirror door guide

A quick learner from The Thumb says:
Have 3 of these per door- are they a wear item? They seem slightly smaller (1/8") than the track and the door bangs around at the top. Thanks.
top mirror guide
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Paul from SWISCO responded:
Thanks for your question. Your nylon top mirror door guide might have worn down or lost its flexibility to keep the doors aligned. Your guide is no longer available and the manufacturer suggests our 23-079 as a replacement.
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