Sliding patio door rollers

A quick learner from Long Island, NY says:
I need to replace the rollers on my sliding patio door. There are no markings anywhere
Please help
Thanks
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Casey from SWISCO responded:

Hello,

I would recommend starting by comparing the dimensions of the 81-051 and 81-052 roller assemblies to your part to see if one of them is the correct match. Thanks for posting! 

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