The 37472-11 is an older version of Telect's current 12" end panel (P/N 02331-01) that uses a uni-body cover with knock-outs.  The 02331-01 uses five (5) interlocking pieces for the cover, which allows access to individual sections of the end panel without having to remove the entire cover.  The individual pieces of the 02331-01 cover also include knockouts for AC receptacles, switches, and alarm lights.