I am putting the gs motorsports tru duals on the durango right now, I am down to putting the simm boxes on but the wiring is different then the schematics. The simm boxes wire colors are 2- white, 1 gray, and 1 black. well the trucks is 2 black one blue and one white. The directions say that if I have the 2 black or a blue I have the wrong one, so I go look to make sure and they are the rear and the front ones are the same color code. So they may have changed in 03. It says to match the colors, I can't does anyone know where to get the wiring schematic for the rear O2 sensors.