o2 sensor help

Hello all , can you help me I have an 01 galant with a 2.4 liter eng, the check engine light came on so I ran the codes and it came back as a bad o2 sensor so I bought the bosch UNIVERSAL O2 SENSOR it the type you have to splice the factory plug into . my problem is the new sensor has 4 wires 2 whites which is the heater ,Black which is the signal and a Gray which is ground and the factory wires are blue ,white, and 2 blacks ,can you tell me how to match these wires up ? Thanks for the help