I need help exactly identifying this part and help on what I need to do because all I know is my van overheated and I had it towed last week and a couple of days ago I started it up and it wouldn't stay started and then died so I looked under the hood and I seen the pulley barely hanging on and the belt came completely off so I need help identifying what pulley it is and the next step on what to do I removed the 3 bolts on the outside to get the pulley off and this is how it looks afterwards

 

water pump has failed the first picture is the water pump pulley