Amazon.com: GLOTRENDS Dual M.2 X4 PCIe Adapter for One M.2 PCIe SSD and One M.2 SATA SSD, Support OS Booting from M.2 PCIe SSD or M.2 SATA SSD, Including 2 x M.2
M.2 NVMe + M.2 SATA 110mm SSD PCIe x4 Adapter with Heat Sink - Micro Connectors, Inc.
x4 PCI Express to M.2 PCIe SSD Adapter - Drive Adapters and Drive Converters | Hard Drive Accessories | StarTech.com
M.2 PCIe X4 Adapter with M.2 Heatsink for M.2 PCIe 4.0/3.0 SSD