Crucial Technology 4GB Upgrade for a Lenovo ThinkPad X201 (All Types) System (DDR3 PC3-12800, Non-ECC,) at Amazon.com
BEWARE: Lenovo Thinkpad L15 Gen3 SSD is practically un-upgradeable. Laptop comes with 256GB and bigger SSD is too thick to fit. There also goes a cooling plate on top. : r/thinkpad
lenovao thinkpad x201 hdd replacing - YouTube
Inside the x201 there are 2 of these ports, one of which used by the WiFi card. Is it possible to use the second for an ssd? : r/thinkpad
Lenovo ThinkPad X201 Disassembly, Fan Cleaning and Thermal Paste Replacement - YouTube