JamesMR_ wrote:
Yeah mine doesn't have the aux input. I've got a 12v in both the cubby hole under the dash and in the centre console (under the arm rest). Also under the arm rest are RGB inputs and that's it. No Aux input anywhere

Your car is normal (and like the rest of ours). It's the terminology used which is confusing you
You need to use the RCA (not RCB) inputs located in the centre console as your Aux input. Red and White carry the audio signal and yellow the visual signal.
To answer your original question, all you'll need is RCA to 3.5mm headphone jack cable and will cost about $10. Switch the HU to AUX audio input and the music will stream through.
I don't like cables sticking out of my phone so I purchased a USB bluetooth receiver which my phone connects to (plugged into a USB cigerette lighter adapter), and then that has a female insert for a 3.5mm audio jack. I then use the shortest possible RCA to 3.5mm cable (10cm's) and get the same result. This also cost about $10 but there's a couple of items to purchase.
Hope this clears it up for you!
