1" diameter off white plastic slotted washers used on a sliding door

A home owner from Sacramento, CA says:
I am looking for off white plastic slotted washers 1" in diameter, 1/4" wide used on a sliding mirrored door.
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Donna from SWISCO responded:
Take a look at our 21-174, Roll Guide. 
This is a slightly different size but it sounds like what you are describing:
Dimensions for 21-174
Please reply with a photo of the item if this is not what you are looking for, we would be happy to research it for you.
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