A little note of correction: the first 160GB iPod classic was released in 2007 about 5 years ago. Just a little FYI so you know the iPod classic you are dealing with. Now, we cannot answer your question at all since we do not know anything about your car's stereo system. You would be better off e-mailing the company who made your stereo system as everyone is going to be different. I am sorry but that is the best route. Otherwise we are just going to use Google (the same thing you can do) to suggest something.
64GB iPhone 5 | 64GB iPad mini | AppleTV 2 (2012) | AppleTV 2 (2010) | 2012 15" MacBook Pro, 1TB SSHD, 16GB DDR3 1600 MHz, OS X 10.8.3 Mountain Lion | Apple Lossless | iTunes AAC 192kbps VBR | iTunes 11.0.2| Library size = 1.04TB | Legacy iPods: 3G 40GB, 4G 40GB, 5G 60GB, 160GB iPod classic (2009)