I know that you can get an Ipod connector for VW headunits, but is there any general USB or aux in available for them? I want to keep the OEM style but I don't own an Ipod, so the Ipod connector isn't much good to me

. I have a Sony headunit with an aux in and a usb slot but it's causing me an unreal amount of trouble and to be honest the OEM look is really growing on me and I prefer it to the look of the Sony.
Any ideas?