JMT ADT-F36B-F37B-D8S PCI-e 4.0 X16 to X8 X8 MCIO Bifurcation Adapter Riser Card 256G/bps Split Extender SFF-TA-1016 with Power Cable (50cm)

https://a.co/d/0fHDRhWT

MCIO Riser cables with 3d printed mounts that sit in the fan bays. https://www.thingiverse.com/thing:2804306https://www.amazon.com/dp/B0DZG8JVG2?th=1