Sorry - no markings. These are in a residential aluminum window about 30 years old.

A handy person from Laguna Niguel says:
Looking to find replacements for either the truck assembly or just the snap-in rollers.
User submitted photos of a window roller.
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Tom from SWISCO responded:
I believe you may be able to use our 87-162 sliding window roller. Please take a look and get back to us with some thoughts.
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