It is possible to mod that piece to accept the AUX input but I'm not sure how they did theirs. The method I know of uses the CD lines to get the AUX signal into the HU. For $135 it could be worth not having to open up the box, cut the traces, solder the connections and mount the jack. But on the other hand, how guaranteed is it to work? And to work for how long? I really like how they mounted the jack right on the face. The other mod has a jack mounted down on the panel below the lower cubby.
If you want the instructions to try your own mod (won't cost you $135, but you'll have to be comfortable soldering), PM me your email and I'll send it your way.
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