Sliding glass door rollers.

A handy person from Beaverton Oregon says:
The only writing on this part is;
Del Mar ENG. Long Beach, Ca.
Pat. 3,670,357
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Emily from SWISCO responded:

Thanks for contacting us! I recommend you have a look at the 81-269 roller. This looks like it may be what you need. Review the specifications and see what you think. 

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