Need 48" track to go with parts.

A quick learner from Baton Rouge, LA says:
I am purchasing the following closet door rollers. Catalog#'s 23-155 and 23-154. What is the part# for a 48" track that would work for these rollers?
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Mike from SWISCO responded:
Marc, thank you for contacting us.

We are in the process of researching a possible replacement for your 48" track. We will post an update on the discussion board as soon as more information becomes available.
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Donna from SWISCO responded:
Hi Marc,
See SWISCO product code 23-500, a complete replacement track and roller set for a 4 foot opening.
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