Putting M.2 SSD in Thinkpad X230 (possible, but requies modification) : r/ thinkpad
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Used - Lenovo ThinkPad X260, 14" FHD Laptop, Intel Core i5-6300U @ 2.40 GHz, 8GB DDR4, NEW 500GB M.2 SSD, Bluetooth, Webcam, Win10 Pro 64 - Walmart.com
New For Lenovo Thinkpad X240 X250 SSD Card Flex Cable Connector M.2 NGFF Cable | eBay