The original Becker worked except for the AM side. I listen to a lot of AM, so I decided to get a new radio. I knew I would have to hardwire it and I figured out what all the wires go to, but...

There are 8 speaker wires (2 for each speaker, positive and negative) that come from the new head but there are only 4 wires coming out of the car (What appears to be Left and Right). How do I remedy this situation? There is a wiring harness conversion kit on crutchfield, but I don't want to spend the money on it if it possible without it. I pretty much refuse to go to bestbuy and have them do it, 1. cause i dont think they will do it right and 2. cause that is quiting...and im not a quitter!

any insight?