Your in luck, I just did the same install yesterday. I bought the harness from cardomain.com. Scosche part number SCOGM02B AND SCHOMDA1B (for the ant.). The harness is about $10.00 and the ant converter about $5.00 (free shipping). The harness is not perfect. There are 4 plugs in the stock harness. One is for the the front speakers, one for the rear, one for the power and one for the CD. I did not use the CD plug on the Reatta harness. I believe the pink wire on the stock goes to the power ant. (blue on the deck). I put in a larger power wire, because the stock wire seemed way too small. It is a PITA to run wire in this car. Good Luck,