Slider door roller

A quick learner from Cardiff, CA says:

I need to identify this roller for an old slider glass door. I need two of these rollers.

Stamped on the side of the roller it says

Del Mar ENGR

Patent No 3137028

Thanks for your assistance in this matter

John 

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Paul from SWISCO responded:

Hi, John. Have a look at both our 81-015 and 81-278 patio door roller assemblies. Look over the measurements of each part carefully and see if either one of these are a match. 

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