Lenovo Thinkpad Ultrabay 12.7mm, 2nd HDD / SSD caddy adapter [TP-W510-T510] - $22.98 : NewmodeUS, Hard Drive Caddys for Notebooks
Lenovo ThinkPad Serial ATA Hard Drive Bay Adapter III - Storage bay adapter - Ultrabay Slim - 5.25 Slim Line to 2.5 - for ThinkPad T420; T430; X220 Tablet; X220i Tablet; X230;