Whick dock station for the T420? Are there different Ones with different fetures? : r/thinkpad
Lenovo ThinkPad Docking Station USB 3.0 for T420 T420s Laptop | eBay
Lenovo ThinkPad Port Replicator Series 3 with USB 3.0 - Port replicator - for ThinkPad L420; L430; L520; L530; T400s; T410; T410i; T410s; T410si; T420; T420i; T420s - Walmart.com