my car is on jack stands.....help

i have a 96 LS integra... i just installed my dc header and i pulled the o2 sensor wires from the little gray box where they are plugged into.... and now i can't figure out which wire goes where.... there are 4 wires, 1 green, 1 white and 2 black.... i tried to line them up on the other side of the gray box, but they are different colours... so i'm not sure which wire goes where.... i need some help asap because my car is sitting on jack stands right now

the green wire is the ground, the white is the hot, and the black ones are the signal. just find out which one is which from the o2 sensor and hook it back up.