I posted this in another thread regarding hacking the stock CD changer input for an Aux input.. This is for 2000-04 with the 14 pin cd changer, not the 8 pin round Din.. Those can be bought from this site too I believe, otherwise you can solder your own connector.
Aux-Niss 2000-04 Aux input
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http://www.picturetrail.com/O1SalsaX <-----UPDATED 8/2/06

I got "IT" from ebay.
Now it burns when I pee..