stanley/monarch safety mirror sliding closet doors

A handy person from phoenix, arizona says:
missing on one of my doors is a brown rubber washer,about 3/4 inch in diameter, goes over white plastic wheel at very top of door. (there are 4 wheels with these brown washers. I am missing one.
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Tom from SWISCO responded:

I'm afraid I don't know what this piece may be. Would it be possible to see a picture of one of the washers you still have? Can you also show me a clear picture of the complete roller assembly it goes on? If we can't get the washer, which is likely, we may at least be able to get you the roller.

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