Amazon.com: Sedna PCI Express (PCIe) SATA III (6G) SSD Adapter with 1 SATA III Port (with Built in Power Circuit, no Need SATA Power Connector, Best for Mac), SSD not Included :
PCIe to SFF-8639 Adapter Card PCIe 3.0 x8 to 2x SFF-8639 for 2.5'' U.2 NVMe SSD | eBay