Does anyone know if the 2008.5 - 2009 OEM stereo will swap into a 2008 Mazda 3? I like the OEM unit well enough, and use the arm rest AUX input all the time, but I'd really like and MP3 CD player, or even better a 6 disc MP3 set up. I can get either off of eBay for a decent price, but the...