2nd SSD HDD Hard Drive Caddy Adapter For Lenovo Thinkpad T440P T540 T540P W540 | eBay
New 9.5mm SATA 2nd HDD SSD Hard Drive caddy replacement for Lenovo Thinkpad T440p T540p W540 with bezel Hard Drive caddy|ssd hard drive caddy|drive caddyhard drive caddy - AliExpress
Nimitz 2nd HDD SSD Hard Drive Caddy Adapter Compatible with Lenovo Thinkpad T440p T540p W540p W541 with Bezel : Electronics
128GB SSDNow M.2 SATA 6Gb Compatible with Lenovo Thinkpad X280, ThinkPad T480s, ThinkPad T540p by CMS C67 - Computer Memory Solutions
TUTORIAL: Lenovo T440P M.2 SATA SSD Upgrade - YouTube