Yes, I've changed mine from the 5" to the 7" recently. Have a spare headunit, it's a 7" with Nav. No airplay/android auto. You can fit a 7" from a Fiat 500, and make changes so it has the Abarth opening screen etc
Fitment was easy. You will need a 7" surround unit, they are on eBay £35-50.
Need Multiecuscan to do the proxi alignment.