There are two series of docks for the Thinkpads I have. One is for the T410 and T420 range (and I think also T430 though I don't have one of those). The other series is for the L440 T440p T450 X250 and T470s amongst others. Later Thinkpads and docks have gone over to Thunderbolt to my understanding.

## T410 T420 docks

## T450 L440 T440p X250 T470 docks