Buy StarTech.com Dual M.2 PCIe SSD Adapter Card - x8 x16 NVMe or at Connection Public Sector Solutions
U.2 NVMe SSD to PCIE 3.0 x4 SFF8639 NVMe PCIe Extension Data Cable 5cm - modDIY.com
Cryo-PC Full Speed NVMe SSD PCIE PCI-Express 3.0 X16 to U.2 Adapter Converter Card Module New - NWCA Inc.
Dual M.2 PCIe NVMe Adapter Without PCIe Splitter Function (PCIe Bifurcation Motherboard is Required), Support M.2 PCIe 4.0/3.0 SSD Soft RAID Setup in Windows/Linux