LEICKE DUAL SATA 2.HDD / SSD Serial UltraBay slim Adapter for Lenovo ThinkPad, for example Y510P, T400, T400s, T410, T410i, T410s, T410si, T420s T420si T500, W500, X200, X220, X220s, X220T with UltraBase, UltraBase Series 3 | with LEICKE hyperspeed Technology optimized for SSD | 9.5mm height (Electronics)
fits perfectly into the T400er but for the T420 and 510 SL you need the thicker model (13.7 mm), otherwise it rattles. Can you mend naturally with Tesa Moll from the hardware store, but for about 50 euros you can download the thicker model.