Ok, I'll write what reports my books:
"Simca 1200 1954, The coupè exhibited by the French firm at the 41st paris Motor Show (7th-17th October), revealed its close derivation from the Fire-Arrow model produced by Ghia for Chrysler"
in the Ghia book and
"Following an agreement with Simca (or, according to other sources, on his own initiative, intended to start a relationship of collaboration) Abarth created, using components of the Simca, this splendid GT coupè, whose lines clearly recall those of the previous model, the Fiat Abarth 103 GT Coupè Ghia."
in the Abarth book below the Simca|Abarth GT Coupè Ghia 1954 technical data (4-cyl 1221cc 45cv....) and
"Another very special number, this time realised in collaboration with another famous Tourin body builder:Ghia. The frame, the engine and the suspension, with special modifications, were those of the Fiat 1100 then in production. it seems that this model also went to the USA" below the Abarth 103 GT Coupè Ghia 1953 technical data (4-cyl 1089cc 64cv....) elsewhere (but no officially) called "siluro".