3.5MM cables can be Mono or Stereo - here's a link to Cables-to-Go which shows both - this is page 1, for mono, then go to page 2;
http://www.cablestogo.com/product_li...FQtpGAodqDrMJg
Also the Belkin Auto Kit is great if you need power to the iPod but you still need a dual 3.5MM plug cable as I beleive this kit only has a 3.5MM jack for use with their FM transmitter or Aux cable. I used this in my Murano before buying my TCH. I wouldn't go back to FM transmitters after having AUX.
So far I'm A-OK with using only the Aux jack to connect my iPod or Sirius Starmate4. I was considering a VAIS SoundLinQ SLI to interface my iPod with the TCH audio system but the sound quality via AUX is so good (& in stereo) that I'll save my $$$ for now.