There is the full intergrated one that can handle charging, audio and navigation. This is your normal for accessory item. Which from memory is: $50 Part number should be identical to the WS Fiesta item: 8M5J 19C142 AA
The alternative (That i would do) is to use a normal iPod to USB computer cable and a Aux cable together to do the same thing. But a new good quality one of each of those would still cost you around $25 or so for the pair.
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