1.8" Micro Sata Ssd 128gb For Lenovo Ibm X300 X301 T400s T410s Disk Drive Hdd - Solid State Drives - AliExpress
ThinkPad X301, upgraded, overclocked : r/thinkpad
1TB SSD Solid State Drive for Lenovo ThinkPad X300,X301,W500,W510,X270 Laptops | eBay
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
Amazon.com: FLEANE 512GB MS02 MicroSata uSATA 1.8inch SSD Compatible with DELL XT1 XT2 IBM X300 X301 T400S T410S Replace MK1229GSG MK1629GSG MK2529GSG 1.8" HDD (512GB) : Electronics
ThinkPad X301 mSATA adapter caddy : r/thinkpad
The definitive X301 SSD upgrade thread - Page 4 - Thinkpads Forum