The pieces that make up this unit are:

Stock # 344-DT3048, Desk Return, 48 x 32 x 30
Stock # 344-CB100, Computer Base, 30 x 21 x 31
Stock # 344-OB110, Adjustable Shelf Base, 30 x 21 x 31
Stock # 344-DB120, File Base, 30 x 21 x 31
Stock # 344-OH200, Open Hutch, 30 x 17 x 48
Stock # 344-DH210, Door Hutch, 30 x 17 x 48
Stock # 344-LF300, Lateral File, 16.25 x 21 x 23.5 (not shown)