Mirror Closet Door wheels need replacing

A handy person from Burbank CA says:
Looking at getting 8 to replace 4 doors. only pics of them installed. Need part number to order please.
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Paul from SWISCO responded:

Hello,

Your roller appears to be screwed through the door frame to the top of the roller using a 33-103 screw. We have a similar roller, the 81-277, which has a 1-1/2" steel ball bearing wheel. I would recommend removing your original roller from the door to confirm how the dimensions below compare to yours. Thanks for posting. 

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Alternate image for 81-277

Alternate view of 81-277
Alternate view of 81-277

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