I say all 4 of them: Chalicotherium (goldfussi+brevirostris), Embolotherium andrewsi, Palaeotherium magnum & Quagga (Equus quagga quagga) will better to appear in PK, right👍😉

Megacerops

I am torn between choosing either Chalicotherium or Embolotherium.