Hi there, I'm new and I just bought 4 new speakers. I got the two front ones hooked up but the back ones are a bit more trickier. I have a 1996 Saturn SL with a Delco AM/FM dash. The model is 21022997 and the serial is 0134818. I just have a simple question. I don't know which wire is which and I just need to know which ones are for the back speakers so I can hook them up without guessing. Could anyone tell me what they are?