Optane Memory Series MEMPEK1J016GAH 16GB M.2 2280 PCIe 3.0 x2 NVMe SSD Solid State Drive L08717-001 Compatible Replacement Spare Part for Intel Compatible and All Systems
What is the difference between PCIe Gen 3 X2 and X4 SSDs? Can these two SSDs be used for laptops that support the PCIe interface? - Quora
Corsair Force MP300 M.2 2280 480GB PCI-Express 3.0 x2, NVME 1.3 3D TLC Internal Solid State Drive (SSD) CSSD-F480GBMP300 - Newegg.com
PX400 NVMe PCIe Gen 3 x2 SSD - GOODRAM
NVMe PCIe x4 x2 M.2 NGFF SSD to PCIe x1 converter card adapter PCIe x1 to M.2 - Walmart.com
1TB M.2 2230 NVMe PCI Express 3.0 x2 SSD (Solid State Drive)-30mm Half Size, Brand : Samsung PM991 MZ-VLQ1T00, KLFGGAR4AA-K0T0 For Microsoft Surface Pro X, Microsoft Surface Pro 7+, Microsoft Surface Laptop
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.