Floor track 23-242 description question

A home owner from Ohio says:
The description for floor track #23-242 states that it accomodates convex rollers. I believe this is wrong and want to make sure you made a mistake before I buy the 72" satin nickel one. Please verify.
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Dave Sr. from SWISCO responded:
This description is correct. The rails on the 23-242 are recessed, requiring convex rollers. The rails do not stick out for concave rollers to ride on. For clarification, see the following video.
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