Could you please first confirm if the second attached picture is your car original center console?
As you said that the size of your original radio is smaller than our double din universal unit, it's strange.
Normally you just need to buy a suitable frame to make the universal head unit fit your car well, sorry that we don't have any frame which can fit the Fiat.
According to our experience, you can use the ISO power cable for your car, and don't need to buy the ISO adapter.
That's all I can help you, hope your understanding.
RegardsStatistics: Posted by Jammy — Thu Mar 23, 2017 6:10 am
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