This NAM thread from ShankRabbit leads you to a web page he created which details making an AUX input cable using bits & pieces salvaged from old computer parts!
Check out his web page for step-by-step details.
DIY AUX input
3 thoughts on “DIY AUX input”
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M&I / GBMINI 
I thought I read the aux input needed some other additional components so the head unit knew it was there. The simple free solution seems up my alley but the $40 price of the real part is still reasonable for most.
Seams a little silly to me given that the OEM AUX input is less than $40 USD and will retain the MINI’s factory warranty.
Why bother with this one as it looks to be more trouble than it’s worth (just to save $40) and will definitely cause you warranty problems at the dealer if your radio acts up, etc.???
It’s nice to see folks figuring this stuff out though.
Half the fun is figuring it out on your own even if it costed you 5 times as much in the value of your own time.