HP A6752-69014 - PCI backplane (card cage assembly) - Includes the metal PCI backplane cage and the 16 slot PCI backplane Retail
HP A6093-69015 - PCI backplane (card cage assembly) - Includes the metal PCI backplane cage and the 16 slot PCI backplane 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 A4856AX - PCI card cage assembly 3.3/5.0V - Includes 12-slot I/O chassis, I/O board, I/O power board, and I/O backplane Retail