OWC U2 Shuttle for up to four NVMe M.2 SSDs in a 3.5-inch Drive
What is U.2 SSD (formerly SFF-8639)? | Definition from TechTarget
WD 2TB 2.5in U.2 NVME Hard drive WUS3BA119C7P3E3
Fusion Dual U.2 SSD PCIe Card - SONNETTECH
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 -