For Christmas, I bought my girlfriend an Alpine 9856 so she can play her iPod in her car. I've read about the GM Class II Data Bus and how you need the special adapter to keep the door chimes and such. However, they're a lot of money and she doesn't care but I can't seem to find just a normal wiring harness for her 2000 Pontiac Sunfire. She has the sedan with 4 speakers. Any help would be appreciated.