Help IDing slider window rollers

A landlord from novato, ca says:
trying to locate replacement window slider rollers for single pane aluminum window. can not find any match on your web site or at HD. part is plastic/nylon and roller wheel is non-groved smooth metal Track seems to be about 1/2". No helpful markings on roller or the window frame itself. House is about 1978 vintage. Can you ID for a few replacements please? thank you, Keith
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Bob from SWISCO responded:

Thanks for writing in. I can't be certain without knowing your old roller's dimensions, but see if the 87-207 could work for you. Let us know if it matches what you need.

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