tandem door roller

A quick learner from Chicago, IL says:
I am looking for two dozen of these
A customer submitted photo of a tandem roller.
Profile picture of Tom
Tom from SWISCO responded:
Thank you for your patience in this matter. We are still researching a possible replacement for this roller, but with no luck so far. It looks similar to our 81-056, but our tab sticks up, rather than straight out. I am not sure if it will work as a substitute.

Would you happen to know the manufacturer of this roller? I can't quite make out the stamp on the housing.
A quick learner from Chicago, IL says:
Tom- The manufacturer was Del Mar. The tab in the picture was initially straight up but bent to attach to our doors. So, a straight up tab may work. Thanks.
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