Just to add to this thread:
I just bought and installed the Aux In Panel. Mitsubishi must make the most generic installation guides ever, maybe because they weren't meant for the likes of me who really doesn't have a clue about his car
After removing the original panel (the key is to use force, but be careful at the same time) I was then tasked with the job to remove the cigarette lighter backing from the panel. Either I'm really stupid or its just impossible, I saw there was a latch which had to be depressed to take it out of the panel but for the love of me I couldn't get it out. My father came along and told me he'd have it out in a second.
So I went back to trying to figure out how to take out the radio with the Mitsubishi manual just showing a circle over the radio part. Thank you for the spoons idea, that was great! Basically (I think!) you ignore the two little slits in the console where you can buy some sort of key to remove it, jam one spoon handle into the edge of the radio, insert a little and lever it out. Repeat for the other side, you should now be able just to pull it out with very little force.
At this point my father came back looking sheepish. He'd given up on removing it and taken to it first with a hammer and chisel and then with a saw. He'd gotten rid of the panel and sawed through the cigarette backing, cutting the two metal contact points and making it unusable.
So I now have to locate a new cigarette lighter backing. If anyone has any idea where to get one of these, please tell me!
Threading the wire through the centre console was a bit iffy, I didn't know what to expect, in the end (with the radio out) I stuck my hand down and grabbed the wires. At this point I remembered I'd ignored the installation guide to disconnect the battery. Oh well, no harm done (I think...)
I didn't know how far in to push the contacts, but they don't want to go in any further without force. The contacts I got were sort of a thick bit for about 6mm, then a bit where you could see the copper parts of the wires, then onto the wire itself. I stuck the 6mm in hoping it's enough.
After putting everything back (that parts easy) I turned to the moment of truth, changed the radio into Aux mode and plugged my MP3 in. Nothing. I'm not sure if I've done something wrong (I don't think I have) or I've used the wrong cable to connect my MP3 (3.5mm to 2 RCA). Please help! The dealership I got it from didn't have a clue about the thing and didn't even know what it was, so I'm pretty sure they can't help.