HDD / SSD Ultrabay Slim Module for IBM Lenovo ThinkPad T40, T40p, T41, T41p, T42, T42p, T43, T43p, T60, T60p, T61, T61p, X4 UltraBase X4 Dock, UltraBase X6, X6 Tablet UltraBase, X60, X60s , X60t, X61 - 9.5 mm adapter (SATA - PATA / IDE) - TheNatural2020
With an SSD inside my IBM R51, I found a quick bike even though it's not a rocket, it allows me to use it faster, therefore compatible with R51