HP D9387-63013 - I/O panel assembly - Mounts to the back of the chassis - Has cutouts for I/O connectors Retail
HP A4856-69101 - PCI card cage assembly - Includes 12-slot I/O chassis, I/O board, I/O power board, and I/O backplane Retail
HP A6961-04055 - I/O section hot-swap fan assembly - Includes two fans mounted in a metal frame Retail