Sliding window roller replacement

A quick learner from San Diego says:
Rollers have a flat spot. They ate 1/2" diameter. The overall length of the assy is 2" and the width of the window frame slot is 5/8". I think the window may be made by Milgard but not sure. The wheels only need to replaced (popped out).
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Bob from SWISCO responded:

Thanks for writing in. I am afraid I don't recognize these window rollers. I am forwarding this discussion to one of my senior colleagues, and we'll get back to you as soon as possible with more information. Many thanks.

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Paul from SWISCO responded:

Thank you for your continued patience with us. Have a close look at our 87-201 sliding window roller and see if this is compatible with your roller. 

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