I have a 94 sl320 believe it's a m104 engine the main injector harness was bad so I used the vin WDBFA63E63E6SF108705 to get a new one this is what I got Delphi 140 440 4605 that is not the right harness it has no knock sensor or air intake temp sensor as well as one of the thermostat temperature sensor s how do I go about finding out which harness I need I've looked everywhere and called Mercedes with no luck thank you in advance Andrew