How do I remove the PCIE brackets at the back of a case?

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Is there such a thing as a GPU support bracket that only takes up one PCI slot in the case? Can I add a GPU using a PCIe x16 slot if I have no

With its solid, all steel construction, this bracket allows you to securely mount your graphics card, or any PCI Express card, vertically inside your case It The gembird 3 pack of PCI EXPRESS slot brackets are made from steel and closes any vacant PCI-E slot on your PC caseTower Easy to install and suppli

play the incredible hulk slot Bracket for a single slot PCIe riser cable  slot Maybe I should try to bodge something along the edge, like in those vent holes, to stop the card moving Desktop :-AMD Ryzen 1800X