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Amazon.com: GLOTRENDS M.2 PCIe X1 Adapter with M.2 Screw for M.2 PCIe 4.0/3.0 SSD (NVMe/AHCI Key M), PCIe X1/X4/X8/X16 Lane Installation, but Only PCIe X1 Bandwidth (PA09-X1) : Electronics
Amazon.com: 2 Port M.2 SSD to PCI-e x1 adapter B or B+M key (SI-PEX40115) : Everything Else
M.2 key B to PCIe x1/USB3.0 dual bus adapter with 2 SIM Slots
NGFF M.2 Key M to PCIe x1 Gen3 8Gbps Extender Cable Adapter R41SR - modDIY.com