Am a bit of a car audio noob and don't really know what am doing, so apologies for what might be a relatively stupid question. Wanted a bit of advice as I am trying to swap my old headunit into the mk2 because it has an aux cable for me to run the ipod from. It seems that it isn't a straight swap though. So I need an adapter of some sort.....
I am taking out the old Sony headunit

and am left with cables like this...


they dont fit my Blaupunkt headunit which looks like this

So I clearly need some sort of adapter which I was told was called an ISO something. However there seems to be millions of versions of these everywhere and not too easy to understand the explanations and to know whether they will fit or not. Can anyone point me in the right direction please....
Planning to upgrade the speakers too as at the moment 3 out of 6 work and the sound is tinny and diabolical. Thinking to go with the Alpines as suggested in another thread. Also need to replace the aerial as it is completely broken and currently the remaining section just sits in the aerial slot connected to nowt.