How is this wool pile installed?

A quick learner from 33062 says:
August 31, 2010
58-161 Does the wool pile fit on the track and sandwhich the glass?
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Donna from SWISCO responded:
September 2, 2010
Replacement wool pile fits into a pre-existing track in a window or door extrusion. This particular wool pile is often used in commercial store front doors.
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