The Fiat 850 regularly appeared (drawn) in various magazines. Not only in Donald Duck but in Spirou, a fun and educational weekly for boys and their fathers too.
In February 1965 the 850 Berlina and in June 1965 the 850 Coupe and Spider were featured. In case you want to see the pictures below in full-screen, click on them.

Fiat 850 Berlina in Spirou 

Fiat 850 Sport in Spirou