Related Products PartDescription 675039-001Hard drive blank (cover) - To fill empty large form factor (LFF) drive bays 790495-001Optical disk drive blank (cover) - Snap fits in the optical drive opening on the front panel 790499-001Fan cover blank - To fill unused fan slots 790515-001PCI blank cover - Covers rear panel PCI slots 2 and 3 when the optional PCI riser or FlexibleLOM riser is not installed 790531-001Fan cover blank - To fill unused fan slots 790538-001PCI blanking cover - To fill empty system board PCI slot or when filled with PCI riser board 790539-001Riser cage blank - Covers the two optional horizontal PCIe slots above the power supply cage