Ahhhh... you're right.
Technically, there is no additional "wiring" or connectors for the aux in. It's all built into the blue connector in the 2005 harness. You'd need to check with the dealer to see if you can get just that portion of the harness (the portion that plugs into the blue connector and splits into the leads for the CD changer and the aux in jack)... I think it may be a separate pigtail.
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