My dad has a 99' Mercedes ML320 (SUV) and wants to install a CD changer. In the back compartment, there's already a stock CD changer wire (ready to be plugged in). My question is... Will most after market CD changers fit with this wire? What's the best way to go in purchasing a CD changer for this car, recommendations? I do not want to get it done at a audio shop... i was thinking about getting one at an online shops like: mmxpress.com or thezeb.com as soon as i know which one to get. THANKS!