Amazon.com: 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 Adapter -
OWC U2 Shuttle for up to four NVMe M.2 SSDs in a 3.5-inch Drive
Amazon.com: PCIe 3.0 to (2) U.2 SFF-8639 Adapter Card, X8, for 2.5" U.2 NVMe SSD : Electronics
Adapter, M.2 to U.2 - M.2 PCIe NVMe SSDs - Drive Adapters and Drive Converters | StarTech.com