You can in some cases but not sure about the Punto unit. If they aren't avaliable from Fiat then you won't get an adaptor for another make such as Sony. If you can get a CD Changer from Fiat, then in some cases Sony and Kenwood can supply adaptors to make their CD Changers fit existing head units. You're best bet is to pop down to your local Halfords/Audio Store and ask them to find out for you.