U.2 NVMe SSD SFF8643 to SFF-8639 U.2 with Cable PCIe x8 Dual Port Adapter - US | eBay
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 -
U.2 SFF-8639 NVMe SSD to M.2 NGFF PCI-e Adapter with Cable
Amazon.com: PCIe 3.0 to (2) U.2 SFF-8639 Adapter Card, X8, for 2.5" U.2 NVMe SSD : Electronics