Cabbase head unit

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Baught a lead off ebay for a aux input the head unit does say AUX I read up on the fact u could get a lead and plug and play but found out it's the wrong plug size and now I'm stumped for what to do
There is the standard 12 pin plug and a blue single pin plug which I have no Idea what it is maybe the Ariel anybody help I have a 07 197
 
That head unit is only the CD player. The radio, amp ect is under the drivers seat. You need a custom setup for the aux on this system. There is a How to on here somewhere. It doesn't give the best sound but it works.
 
You do relise it plugs in under the seat and not the cd changer in the dash