HP - A1703-60002 - I/O Backplane Board 2-Slot A1703-60002 - HP - 2-Slot I/O Backplane Board $84.74 $71.81
HP - A1703-60089U - Backplane Board 4 I/O Slots A1703-60089U - HP - 4 I/O Slots Backplane Board for 9000 / G30 $182.29 $154.48
HP - A6144-69102 - Backplane Board 12-Slot PCI I/O A6144-69102 - HP - 12-Slot I/O PCI Backplane Board for 9000 RP5470 $265.69 $225.16
HP - A6961-60401 - I/O Board 8-PCI Slots RX4640 A6961-60401 - HP - RX4640 I/O System Board w/ 8-PCI slots $532.46 $451.24