Lian Li O11 Dynamic + Cooler Master Vertical GPU Holder : r/buildapc
Vertically Mounted The Ol' GPU! : r/pcmasterrace
Amazon.com: Cooler Master Universal Vertical Graphics Card Holder KIT VER.2 with 165mm/6.5in Riser Cable, for Full Tower / Standard ATX Chassis with at Least 7 Available PCI Slots : Electronics