StarTech.com U.2 to M.2 Adapter for U.2 NVMe SSD - M.2 PCIe x4
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StarTech.com M.2. PCI-e NVMe to U.2 (SFF-8639) Adapter - Not Compatible with SATA Drives or SAS Controllers - For M.2 PCIe NVMe SSDs - PCIe M.2 Drive
StarTech.com 4-Lane PCI Express to SFF-8643 Adapter for PCIe NVMe U.2 SSD - U.2 2.5 NVMe SSD Adapter (PEX4SFF8643) - interface adapter - SAS 12Gb/s - PCIe x4
QNAP M.2 PCIe NVMe SSD to U.2 PCIe NVMe SSD Converter Adapter (QDA-UMP) - A-Power Computer Ltd.
U.2 NVMe SSD SFF8643 to SFF-8639 NVMe U.2 with Cable PCIe x8 Dual Port Adapter
Current status of m.2 to u.2 adapters - Hardware - Level1Techs Forums
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StarTech.com M.2. PCI-e NVMe to U.2 (SFF-8639) Adapter - Not Compatible with SATA Drives or SAS Controllers - For M.2 PCIe NVMe SSDs - PCIe M.2 Drive
x4 PCI Express to M.2 PCIe SSD Adapter - Drive Adapters and Drive Converters, Hard Drive Accessories
Product StarTech.com M.2. PCI-e NVMe to U.2 (SFF-8639) Adapter - Not Compatible with SATA Drives or SAS Controllers - For M.2 PCIe NVMe SSDs - PCIe M.2 Drive to U.2 Host
StarTech.com U.2 to PCIe Adapter - x4 PCIe - For 2.5 U.2 NVMe SSD - SFF-8639 PCIe Adapter - U.2 SSD - PCIe SSD - U.2 drive (PEX4SFF8639) : : Computers & Accessories