CMS 8GB (2X4GB) DDR3 8500 1066MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Lenovo® Thinkpad X201 3249-Xxx; 3626-Xxx; 3680-Xxx - A35 at Amazon.com
Amazon.com: 2nd HDD SSD Hard Drive Optical Bay Caddy Adapter for Lenovo Thinkpad T400 T410si T410i T420si T430si and x200 x201 x220 UltraBase : Electronics
Amazon.com: 240GB 2.5" SSD Solid State Drive for Lenovo ThinkPad X200si,X201,X201i,X201s,X220,X220i,X230,X230i,X230s,X240,X240s,X250,X260 : Electronics
1TB SSD upgrade for T420. : r/thinkpad
Lenovo Thinkpad X201 Laptop Disassembly | Ultimate Fix for Overheating | Clean it Yourself - YouTube
lenovao thinkpad x201 hdd replacing - YouTube
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
Crucial Technology 4GB Upgrade for a Lenovo ThinkPad X201 (All Types) System (DDR3 PC3-12800, Non-ECC,) at Amazon.com