Controller ((link)) | Pci

The term "PCI controller" often appears in specific technical contexts where the interface is adapted for specialized hardware.

If you were instead referring to a physical piece that covers the PCI Controller chip on the motherboard itself (the tiny silicon chip soldered to the board), that would be a heatsink or thermal pad . These are used to cool the chipset on high-end motherboards. However, based on common PC repair terminology, you most likely need a standard expansion slot bracket . pci controller