Black Long Dock Extension Extender Cable 30-pin Male to Female 100 cm = 1 Meter = 3.25ft = 39.37 inches for iPod and iPhone 4 iPad 2 - Audio Extension for Bose Sony iHome & other Docking Stations - Extend Your Car Audio Dock
These types of extension cables are extremely hard to find and I ended up having to buy the same one I bought a couple of years ago for my VW Jetta.  The dock is located way inside my center armrest in the car and a real pain to fit an iphone or ipod in.  The last one broke because you have to squeeze the part that goes into ipod to release and it finally gave away and broke.  I wish it just came off like my iphone charger does.  What I was really looking for was a shorter extender but this was the shortest