OWC 4.0TB U2 Shuttle 3.5-inch NVMe U.2 SSD at MacSales.com
What Is U.2 SSD? How about U.2 SSD vs. M.2 SSD? An Easy Guide - MiniTool Partition Wizard
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 -