OWC MISADPU2PCIE2 2.5-inch U.2 SSD to PCIe Adapter at MacSales.com
Dual M.2 PCIe SSD Adapter Card NVME/AHCI - Drive Adapters and Drive Converters | Hard Drive Accessories | StarTech.com
mini PCIE to USB adapter – Ronoth
OWC Accelsior 1A Apple Factory SSD to PCIe Adapter Card
Amazon.com: M.2 NVMe PCIe Adapter,Dual M2 SATA B Key and NVMe M Key SSD to PCI-e x4 Adapter Card for 2280 2260 2242 2230 SSD, with M.2 Heatsink (M.2 NVME Mkey Card) :