AUX/iPod sound input via CD Changer port

[u6crash]

Hey folks, I'm looking for the simplest solution to hook up either an auxiliary sound source or an iPod. USA Spec makes two adapters, one that is simply a line in. Right now this is the direction I'm leaning in.

I've got the 2002 GT Premium with six CD changer. Are there other makes/models for AUX inputs that anyone here has experience installing or using?