Amazon.com: PCIe Gen3 x2 USB 3.2/3.1 Card ASM3142- PCI Express to 4-Port Type C HUB Internal Expansion Card Controller Adapter PCI Express Card Desktop PC Support Multiple INs : Electronics
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MAIWO PCIe Gen3 x2 USB 3.2 / 3.1 Card ASM3142- PCI Express to 2-Port Type C HUB Internal Expansion Card Controller Adapter PCI Express Card Desktop PC Support Multiple INs - Newegg.com
PCIe Gen3 x2 NVMe SSD vs SATA 3 SSD comparison - Storage Devices - Linus Tech Tips
I harvested a PCIe Gen3 x2 NVMe 1.3 SSD from my older laptop, the problem is that its length is short. I've held it in place with some tape, it should hold.