Source for Cassette racks

Building a spinning vertical rack to hold audio/video media for the IL's.
Having trouble finding a vertical rack to hold cassettes horizontally.
So rack goes up and down and cassettes lay flat in slots
R-CASS-R R------R R-CASS-R R------R
The sources, Rockler, Woodworkers Supply, Lee Valley, all have short racks instead of a long tall one, and they are not recommended for vertical orientation.
Other sources out there?
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