Acorn slider windows manufacturer around 1979

A home owner from Montana says:
Like to find replacement rollers for Acorn slider windows manufacturer around 1979
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Tom from SWISCO responded:

We have a few different Acorn brand rollers, but two in particular stick out to me as potential replacements. See our 87-010 and 87-099 . Carefully compare our pictures and dimensions to your existing roller to confirm which one, if either, will work for you.

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