you are not dreaming!!
you will need to buy two things.
first is the thing to connect to your AUX input from your car stereo which you can get from this site
and its the "STEREO 3.5MM TO RCA"
http://www.ziplinq-europe.com/retrac...ble-audio.html
after that you will need to get the adapter (converter) that will make it fit to your treo. which is on this site
http://www.proporta.com/F02/PPF02P05...745&t_mode=des
when you have all of that your ready.