NVMe external adapter U.2 (SFF-8639) to NVMe M.2 and PCIE x4 slot
Low-Profile M.2 NVMe SSD to PCIe x4 Adapter with Heat Sink for 1U - Micro Connectors, Inc.
M.2 Key M to PCIe x4 Extender Cable Adapter, R42S - Newegg.com
M Key M.2 PCIe NGFF SSD to PCI-e Express 3.0 x4 Adapter Card Controller with Heatsink for 2230 2242 2260 2280 mm M Key M.2 PCIe Based AHCI NVMe SSD - Newegg.com
Newest NGFF M.2 to PCI E 4X Riser Card M2 M Key to PCIe X4 Adapter with LED Indicator SATA Power Riser for Bitcoin Miner Mining|Add On Cards| - AliExpress