Sliding door rollers

A quick learner from California says:
I couldn't find numbers or markings on the rollers. Thanks
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Casey from SWISCO responded:

Hello,

I would recommend starting by comparing the dimensions of the 81-166S to your roller. If you notice any discrepancies, please write out your exact measurements and we can go from there. Thank you. 

Dimensions for 81-166s
Dimensions for 81-166s

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