I want to replace 2007 base radio to 2008 Prius radio. My original 2007 radio plays only audio CD (pictutre attached). New 2008 Prius radio plays MP3 and has AUX (picture attached). After I installed new unit it works - at least radio. MAIN QUESTION: I want to use AUX and I do not want to buy a special kit for it for $152 at Car Toys. How to connect 3.5mm jack to new stereo?