Sliding glass door roller

A home owner from Va Beach Va 23454 says:
Door has one 2 wheeled roller on each side. The only markings are 'Del Mar Eng Long Beach Cal' plus a patient number which is mostly worn away.
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Lauren from SWISCO responded:

Hello, thank you for posting,

Please start by comparing your roller assembly to the 81-051 or 81-052 to see how they compare to your original. Let us know what you think and if you have any additional questions! 

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